Hey all, been having this rough idle for about 500 miles now. Car is stock except for AR downpipes. Car is only throwing cat efficiency codes. So I am pretty much stumped on what the hell this issue could be.
I seafoamed the car, and put in all new fluids. Still gives a rough idle. Cold or warm doesn't make a difference. You can feel this vibration throughout the whole vehicle. When the hood is popped you can see the factory intake shake a little. Upon inspecting the RPMs, ocassionally will dip approx 25-50 rpms then go right back when this happens. No misfire codes though, and when Active Autowerke looked at each cylinder it was fine.
If anyone has experienced this and/or solved this issue please let me know. Thanks!
-Adrian