okay so about a month ago when I started my Audi A4, it starting misfiring. At idle, RPM was about 850 and the CEL came on and after a few seconds being at idle, the ECP light came on and the shaking got worse. I connected the OBD II and it gave me fault code P0302. so I automatically suggested it was the spark plug or coil pack. Had all 4 cylinder spark and coil packs replaced, cleared the codes, turned the car on and it still had the misfire. When driving, sometimes it stutters when I pick up speed, but after that its running good. its only at idle that it starts to misfire and CEL, ECP come on.


My car is around 98700k miles right about now.


There is this kind of whistle coming from under the hood at idle. Strong suction when taking the oil cap off. I have read that the whistle might be a vacuum leak or the PCV.


Any ideas on whats wrong with my audi?

 

i meant the EPC not the ECP