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My mechanic is at the point of replacing fuel injectors as the next thing to try. According to him, the miss fires seem to only occur on the #5 and #6 cylinder. He hasn't found any other clues to what is going on and since this problem only occurs in the morning and only last for no more than 20 minutes...it's frustrating to diagnose.
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I love it when peoples "mechanics" want to replace parts instead of diagnosing the concern..you have probally spent a good amount of money with him "trying" things.
This concern has been around for years and is a fairly easy fix, just a matter of finding someone who has the equipment to perform the repair.
The problem is that your misfire is caused by the ball sticking in the seat of your poppet (part of the injector). This is what is causing your cold misfire (if you would have done a search, you would have found tons of threads about this).
Well there is a GM TSB (00-06-04-003B) referencing the condition and proper repair procedures.
To fix your truck, you will have to take it to the dealer for this procedure because they are the only ones that have the tools.
If the poppets will not unstick, there is a new conversion kit available from GM that works great and I have not seen or heard of any complaints after the conversion was performed.
Oh yea...cleaning injectors with aftermarket cleaning solutions will not unstick the poppets.