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Old 06-10-2015, 10:06 AM
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07 5.7 Random Misfire

Someone please help! I have an intermittant issue. Only happens when outside air temp is above 70, and the engine is up to full operating temp.
If I shut the engine for a short period of time, upon restart it will misfire cylinders. This happens at idle, under load, even in reverse! I have so far changed the plugs (Champion 570s), seafoamed the intake, changed the cam & crank sensors, disabled the MDS, and seafoam in the gas tank. When the problem is not happening it runs great. Problem is, with summer coming it is happening more frequently. The codes thrown are P0300, P0202, P0204, P0205, P0206, P0207 & P0208 all at the same time. I am trying to find the wire from all injectors to PCM to rule out any breaks/shorts. Which connector in the harness would it be? Any other suggestions would be appreciated. Next stop new PCM, but don't want to throw money at the problem without being more certain. Thanks.

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