Re: Idling is irratic! What to check for? (otobon)
Make sure your EGR isn't clogged. It happend to me and I went through all of the usual measures and couldn't fix the dam thing. Here is my list of common fixes
-Clean ISV
-Check for Vacum leaks (there easily missed so your best off replacig all the hoses, dont worry there cheap)
-Clean MAF very carefully they are not cheap, a little rubbing alcohol and a Q-tip
-Clean ECU connection. Electrical contact cleaner than a little electrolytic grease.
-Check spark plug wires for shorts
-Replace temperature sensor
-Tighten all connections on the intake
-Check fuel pressure
-Vacum test EGR (they clog <---this turned out to be my problem)
-Replace 02 sensor.
Any time your enginer is runnning rich you are going to get an O2 sensor fault code. Resist replacing the sensor untill you have ruled out all of the above becasue often times it is simply the O2 reporting the poor A/F ratio. If anyone wants to give the O2 a try I've got one I pulled out of my car that works fine. Make a resonable offer.