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My 2003 GMC Yukon has code p0300, so far i have changed

Customer Question
My 2003 GMC Yukon...

My 2003 GMC Yukon has code p0300, so far i have changed spark plugs and wires,

Mechanic's Assistant: How many miles are on the car? When did you last change the plugs?

140,000 miles, plugs were changed at 138k

Mechanic's Assistant: Are you fixing your Yukon yourself? What have you tried so far?

I have changed plugs and wires so far, feels like a miss at idle

Submitted: 5 months ago.Category: Chevy
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Answered in 4 minutes by:
3/12/2018
Chevy Mechanic: david craig, Auto Mechanic replied 5 months ago
david craig
david craig, Auto Mechanic
Category: Chevy
Satisfied Customers: 5,985
Experience: owner/mechanic at 3D Automotive
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Hi my name is ***** ***** I'll be more than happy to assist you. Please allow me a few minutes to review your information. Thank you

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Chevy Mechanic: david craig, Auto Mechanic replied 5 months ago

start disconnecting a coil pack at a time until you notice disconnecting one, doesn't have an effect on the engine running.

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Customer reply replied 5 months ago
ok, i will get back to you
Chevy Mechanic: david craig, Auto Mechanic replied 5 months ago

ok

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Customer reply replied 5 months ago
pass. rear cyl makes no diffrence when plug wire is disconected, however I did notice A strong consistant spark from plug wire to exhaust manifold when disconnected from plug but think that would be normal.
Chevy Mechanic: david craig, Auto Mechanic replied 5 months ago

let me decipher that

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Customer reply replied 5 months ago
what a putts
Chevy Mechanic: david craig, Auto Mechanic replied 5 months ago

oh crap, I forgot about you.

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Chevy Mechanic: david craig, Auto Mechanic replied 5 months ago

I apologize

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Chevy Mechanic: david craig, Auto Mechanic replied 5 months ago

and that would be Putz

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Chevy Mechanic: david craig, Auto Mechanic replied 5 months ago

any headway?

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