Questions:
- What is the EGR Valve Position (EVP) sensor? What does EGR stand for? What does the Electronic Valve Position sensor do?
- If this EGR thingy is kaput would it cause rough idling/backfiring driving when engine is cold?
- does the TAB do? (Thermactor Air Bypass solenoid)
- Would the Engine Coolant Temperature sensor (ECT) cause rough idling/backfires driving when engine is cold?
- If none of these guys are the problem......any suggestions?
Thanks a lot.