[neallewis]

I'd check it with a vacuum gauge first to verify the engine is running healthy physically. its oldschool, but very simple and cheap to do. Electronic diagnosis with fault code logging frequently shows the symptom, but not the actual cause. you can also pickup a cheap OBD2 code scanner to check and reset codes yourself. some codes can be general and may have you swapping all sorts of electronic bits, when the problem could be more basic and mechanical, not electronic.