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I have a '98 GMC K1500 w/ 5.7. Once in awhile it won't

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start. This is what it...
I have a '98 GMC K1500 w/ 5.7. Once in awhile it won't start. This is what it does as I try starting: fuel pump hums as it charges, starter cranks strong, fires like a regular star - but dies in a split second as if it only had time to fire a few cylinders. I try starting again and the same thing happens. As I keep trying about 1 out of 4 times it won't fire, then it fires again. It will keep doing this for 10 to 30+ attempted starts and then eventually it start and runs just fine. Sometimes I give it a Jump which doesn't seem to make a difference till the battery starts weakening cranking slower. It doesn't matter if I remove air filter or relieve vacuum pressure. It has this problem about 1 or 2 times a month, more often in summer heat and rarely in winter. I have a long list of repairs and replaced parts over the last 2 years: fuel pump, fuel relay, fuel pressure regulator, fuel filter, battery, starter, alternator, coil, spark plugs (top brand), air filter, all O2 sens ors, distributor cap and rotor and probably forgetting something. Any ideas what could cause this? ? ?
Engine light on with codes: PO102, PO171, PO174, PO303, might be more. Have cleared codes and they come back.
Another thing that could be related, sometimes truck gets in this gutless mode when I accelerate it stumbles and shakes and runs so bad it rattles the whole rig ( similar to as if there are several spark plug wires disconnected). And other times it will run good, accelerate very good.
Submitted: 1 year ago.Category: GMC
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Answered in 31 minutes by:
8/13/2016
GMC Mechanic: Mike S., ASE Certified Technician replied 1 year ago
Mike S.
Mike S., ASE Certified Technician
Category: GMC
Satisfied Customers: 7,772
Experience: GMC N.A.I.S.E. Certified Auto-Mechanic
Verified

don't crank the starter for more than 10 seconds without allowing it to cool down for 10 seconds or so.

it sounds to me as though you have either a loose connection or a security issue.

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GMC Mechanic: Mike S., ASE Certified Technician replied 1 year ago

Did that answer your question? If so, kindly leave me a positive rating, so I get credit.

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GMC Mechanic: Tims Auto Repair, GMC Mechanic replied 1 year ago
Tims Auto Repair
Tims Auto Repair, GMC Mechanic
Category: GMC
Satisfied Customers: 16,161
Experience: have owned a repair shop for 25 years
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Hi, My name is ***** ***** for the delay.

I will do my best to assist you.

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Tims Auto Repair
Tims Auto Repair
Tims Auto Repair, GMC Mechanic
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