Ok OVP is out of the question I replace it this afternoon dealer charge me $76 took it out right in the parking lot replace it in 2 secs , the car started ok but after 2 mins the rough idling started again It took the car 5 mins to come back to normal and now on the way home my check engine light came on , could the check engine light have something to do with my rough idling or what usually make the check engine light come one on a MB
Please help