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The car has run fine since it was purchased new... now it has a problem where maybe one a week it will do the following. It will start perfectly when you first drive it... you will stop at a store, and then when you return to the car it will misfire to the point that it will no longer idle... you can only keep it idling by holding your foot on the gas.. the ODBII codes are for misfire on 3 out of hte 6 cylinders and a for multiple misfires... I took it to the dealer, and he said nothing was wrong... he then said he test drove it and got a reading on the EGR valve.. He replaced it and now it continues to do the same thing... clearly I have no faith in the dealer and am wondering if anyone else has had similar issues. It only does it after you've driven the car but not every time just randomly... more often than not it functions perfectly.

 
Rep Power: 0

i would say cam sensor or exhaust you change the exhaust or take any parts out of the stock?