1999 Oldsmobile Aurora. Question: my 98 Olds Aurora seems to have a misfire. I just changed the spark plugs and wires last year and i checked all the coils (checked the spark plugs and wire as well) but all seems to be in order.
I cleaned out my egr valve but it made no difference, the check engine light comes on from time to time but it goes away after some time. The car seems to idle rough more when its in gear than when in park. Sometimes if i don't put it in neutral at a light it will stall out, furthermore it seems to be affected more when the heat or a/c is on than when its off. There is a definite misfire it can be felt under acceleration and at all stops. As I said all the plugs, wires and coils are good.
What else could be causing this problem?
Answer: The next step is to have the system scanned for codes. Most of the large national parts store chains will do this for free. The codes(s) will give some direction as to where to focus on repairs. Sticking injector is a possibility.
Vacuum leak also. The idle worse in gear than not, could be a worn engine mount. Sounds like you have several problems. As first stated, need to get the system scanned to not where to continue diagnosis.
Car Repair Help, Questions And Answers
World Of Wheels Electrical Testing Belt Diagrams Mustang Engine Overhaul All about Tires