Keith Goodman

My car has been sputtering off an on. I hooked up my OBD 2 to my car and the reading says PO308, PO358. (Coil pack cylinder #8. I replaced the coil pack and spark plugs The car ran fine for a half hour while on the freeway. Then it started sputtering again, the same readings came back. Pulled over turned my car off, immediately turned it back on, drove home an entire hour and it ran fine. . Started sputtering again in the morning when the car got hotter, stop and go traffic. Spark plugs looked good. Could it be the wiring harness to the coil pack or the power train module?
Help!!!!

BigHat

This is the thread created to discuss the new S-class coupe. You'll have better luck reposting in an SL thread geared towards cars of your vintage.