Engine Performance problem
2000 Oldsmobile Alero 4 cyl Automatic
I have done everything I can think of, so hopefully someone can help point me in the right direction!
Four days ago, I added some fuel injector cleaner to my gas tank. I drove it for about 15 minutes until it began to idle rough and eventually stall while I was stopped at a stop sign. I shut it off and had a hard tme starting it back up - I tried several times until it finally started. Since then, it has idled really rough and the tachometer jumps around just under 1000RPMs and has hesitated whlie I take off from a stop or idle. It runs fine at highway speeds though. I took it to Autozone where they said that it didn't pull any codes other than the engine having " multiple misfires". I changed the spark plugs and " wires" (more like boots), replaced the IAC valve, replaced the MAP sensor, replaced the throttle position senor, replaced the fuel filter, replaced the air filter, checked a vacuum hose and didn't see anything suspicious, and I checked the coils which all appear to be sparking fine. My next thought is that the problem cound be the fuel injectors. Does anyone have any feedback/ideas that may help? I have no idea how to change/replace fuel injectors and I'm at a loss for ideas about what could be wrong. Any information would be helpful!
Wednesday, August 19th, 2009 AT 9:50 PM