I have a 2007 Audi A4 4 door sedan with 62,000 miles. Its a great car EXCEPT periodically the car has trouble starting and then will buck or lurch a bit. The EPC light comes on and sometimes so does the check engine light. The bucking/lurching lasts for a minute or 2. Sometimes the EPC light turns off. I’ve taken the car to both the Audi dealership as well as to a local mechanic. Neither have been able to diagnose the problem or replicate it for that matter. Several days ago I had the same problem except when the bucking/lurching subsided, I could not accelerate beyond 30 mph for several minutes. The car “shifted” beyond 30 mph and is now running fine. EPC light is off but check engine light remains on. BTW - when this happened the first time, we thought it might be the battery. We replaced the battery but there seems to be no correlation between the battery and the symptoms.
Would love your thoughts!