Cylinder 1 Misfire at Idle
Cylinder 1 is misfiring at idle.Have changed plug,coil and injector.This problen showed up after head removal and replacement.
Check the compression on that cylinder. If it's low, Could be a defective head gasket. Also, when you remove the spark plug, check it for wetness from coolant. Another sign of a defective head gasket. HTH. -Jim
http://www.autotap.com/techlibrary/diagnosing_misfires.asp link to website, gives you a few ideas to wut may be the cause, or perhaps jus take to a mechanic if you don't find any issues related.
i had that problem with my 2007 at 75,000 miles on the 4th cylinder take it to a gm dealer ship they will probably replace the engine mine was still under 100,000 miles and it was replaced at free of charge otherwise it would have be 5 grand. we had changed plugs and coils etc and it had had like 65,000 misfires and there was some thing wrong with the engine from manufacturing
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