Quote:
Originally Posted by PBFreeland
The engine runs relatively smoothly as long as I keep the throttle open... It idles pretty rough even when it's warmed up-- idles rough in the sense that the engine shakes pretty bad, but it usually stays on after it's warmed up.
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Okay, this confuses me. Is the idle pretty rough just when warmed up, and smooth when cold, or pretty rough cold or warm (or relatively smooth?), it only stalls when cold? If pretty rough all the time, then the problem may be more related to a vacuum leak, coolant temp sensor, EGR valve, or plugs and/or plug wires more than an IAC. When holding the throttle open to keep the engine running when cold, what engine speed to you hold it at - something quite a bit higher than normal idle speed?
But if it really is relatively smooth even at normal idle speeds, I'd still suspect the IAC as the primary cause. Sounds like you still need to perform a tune up. The IAC will attempt to maintain idle speed as the load on the engine changes, so it makes complete sense that it would stall when put in drive/reverse. Same would go for turning on the A/C/defrost or turning the steering to one of the locks.
-Rod