Cylinder 1 Misfire at Idle

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 know its been a while, but i am having the same problem did u ever find an answer? thanks

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