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I have a 08 GMC 5.3l M code engine. Got a misfire in #6.
I have a 08 GMC 5.3l M code engine. Got a misfire in #6. Spark plug, coil, wires all good. Could it be as simple as the oil pressure sending unit filter? Is it possible for oil to get to all but 1 cyl… read more
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JOHN aka Eauto
self employed
High School or GED
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I have a 2004 GMC Yukon Denali XL that started to misfire
I have a 2004 GMC Yukon Denali XL that started to misfire once my battery began to die. This was about 3 days ago and now it's getting worse. … read more
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I HAVE A 2003 GMS SIERRA ITHA P0300 CODE OF MISFIRWE. THEY
I HAVE A 2003 GMS SIERRA ITHA P0300 CODE OF MISFIRWE. THEY HAVE DONE MANY CHECKS AND STILL CAN'T FIND PROBLEM. THEY WERE INSTALLING NEW O2 SENORS AND THE UPDATING SEEMS TO HAVE FRIED MY ECM. COULD THE… read more
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Getting a P0300 code - random misfire. It comes on when the
Getting a P0300 code - random misfire. It comes on when the engine is inder load ie. accellerating or going up a hill … read more
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2008 GMC Yukon hybrid. Random misfire. Replace coil packs
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sprinkles08
sprinkles08
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Have to press on the gas pedal somtimes for it to start, no
have to press on the gas pedal somtimes for it to start, no engine light either, gave it a tune up, new plugs and wires, cleaned throttle body and fuel pressure is at 55-60psi, check coils, they are g… read more
Amedee
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Changed the plugs and coils on my 2009 GMC Acadia. Now it is
Changed the plugs and coils on my 2009 GMC Acadia. Now it is hard to start and idles rough and although it is driveable it is slow to take off … read more
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I have a 2007 GMC Yukon with code P0304. I have changed
Hello, I have a 2007 GMC Yukon with code P0304. I have changed wires, plug, injector, and have moved coil pack around. #4 still misfire. What else could it be?… read more
Gary
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I have a 2008 GMC Sierra 2500hd, and I have been having
Hello There! I have a 2008 GMC Sierra 2500hd, and I have been having problems with a random misfire I ran the scanner and all I have is P0300 and I noticed that if I disconnect the Barometer air press… read more
BOBBYSS
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GMC Envoy SLT: Check engine light blinks. stops when I let
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GMC Sierra: 2000 GMC Sierra SLE 5.3L V8. The MIL light is not
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Ron
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GMC Yukon SLE: hello i have a 1996 gmc yukon. I was having
hello i have a 1996 gmc yukon. I was having rough idle and random misfires, I replaced the intake gasket and replaced the spider injectors with the mpi upgrade, I also replaced the maf sensor and map … read more
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GMC jimmy: I am working on a 96 gmc jimmy runs ok at idle but
I am working on a 96 gmc jimmy runs ok at idle but when put in gear and try to go down the road it jerks and will not accelerate and sets random misfire code if maf is unplugged it will run better but… read more
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GMC Yukon XL 1500 SLT: I have a 2004 Yukon XL, 5.3L. Im returning
I have a 2004 Yukon XL, 5.3L. I'm returning to Texas from Yosemite via Southern CA. The check engine light came on now and then while I was in SoCal for a week, finally stayed on for many miles in AZ.… read more
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GMC Yukon: 2007 gmc yukon 5.3l engine miss firing on #5 cyclinder
2007 gmc yukon 5.3l engine miss firing on #5 cyclinder i have done a tune up,changed coil pack and injector checked the fire and injector with testers they were fine has 165psi on all cyclinders spray… read more
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GMC Sonoma Pickup: I have a 00 GMC Sonoma with a 4.3 L v-6
I have a 00 GMC Sonoma with a 4.3 L v-6 that is reading random Misfire. It only stutters in first 15 min and when the air is damp Or just rained. If it is real dry outside it has no problems at all. I… read more
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I have a 2003 Yukon with a 5.3L and 145,000mi. The truck has
I have a 2003 Yukon with a 5.3L and 145,000mi. The truck has run great all summer, but now that it has gotton colder (below 50'F) the truck warm-up circuit does not seem to be working. At cold start-u… read more
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GMC: Hello I have 2003 yukon 5.3l. that car ilde running is
Hello I have 2003 yukon 5.3l. that car rought ilde and shaking and can not speed over 40mph when diagnotic it said code engine 1,2,3 misfire, evapovation, engine data 1. I did change all spark plug an… read more
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Meet the Experts:

Gm Tech (Cam)

Gm Tech (Cam)

GMC Mechanic

1,837 satisfied customers

GM Grand Master Technician 2007. 14 year experience.

Gary

Gary

ASE Certified Technician

1,589 satisfied customers

GCM master tech over 25 years

Dave Nova

Dave Nova

GMC Technician

929 satisfied customers

ASE Master Certification. GM World Class Certification

Chris (aka-Moose)

Chris (aka-Moose)

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705 satisfied customers

16 years of experience

Ron Z.

Ron Z.

- GMC Tech -

291 satisfied customers

18+yrs experience. State Inspector & GMC Diagnostics/Repair

JFN1

JFN1

ASE Certified Technician

272 satisfied customers

GM Master Technician

Don - Mo Lurch

Don - Mo Lurch

ASE Certified Technician

234 satisfied customers

GM, GMC, Chevrolet Cert., Heavy Line Mech, Race Shop Owner, Mobile Electronics

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Disclaimer: Information in questions, answers, and other posts on this site ("Posts") comes from individual users, not JustAnswer; JustAnswer is not responsible for Posts. Posts are for general information, are not intended to substitute for informed professional advice (medical, legal, veterinary, financial, etc.), or to establish a professional-client relationship. The site and services are provided "as is" with no warranty or representations by JustAnswer regarding the qualifications of Experts. To see what credentials have been verified by a third-party service, please click on the "Verified" symbol in some Experts' profiles. JustAnswer is not intended or designed for EMERGENCY questions which should be directed immediately by telephone or in-person to qualified professionals.

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