Mil Light, Rough Idol

[samanthashane]

I own a 2008 5sp auto FG xr6 sedan. had the muffler behind the cadilac converter replaced a little over a month ago and two weeks later , after driving daily in those two weeks I started my car and the MIL light was on and my car was idling like a pig? in this same week my brother got a bad batch of fuel from our local service station which I also use not sure if that could be the problem either, anyways I took my car to local mechanic and he put scan tool over it and removed the MIL light, it told him that my cam had somehow advanced itself? he proceeded to check the car over, made sure oxygen sensor was plugged in and clean, tried a few new ones to see if mine was broken, checked trottlebody, air filter, fuel filter, oil filter, coil plugs, spark plugs and done a full service inc new oil even though my car had only been serviced by him 4500ks ago. he couldnt find any parts to be faulty, checked for a crack in new muffler. it seems to be running slightly better but it is still very noticable and very annoying. it idles rough in P,N,D,R. Reverse and drive are the worst but as soon as u start driving its fine there seems to be no problem at all its only when idling!! anyone had simmilar problems??? what did you do to fix it?? heard that getting car flashed back to factory settings may rectify problem?? any help would be great!!! due to have a baby in 8weeks would like car to be running properly before then!!!

[ratter]

so your mechanic could not diagnose it or you don't agree with diagnosis?

Did he check your cam timing?