Quote:
Originally Posted by quatin
Before you start replacing things for a rough idle. Try cleaning the throttle body. Run seafoam through the vacuum lines and fuel conditioner in the gas tank. Or you can go to a shop and get an air/fuel induction service.
550-650 RPMs is the normal idle speed. A clogged cat can do this to you as well.
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I think the idle speed is a bit of a moving target. The FSM says 700 +/- 50, but I've know plenty that idle lower like what you are saying. Mine idles at about 600 but I think what the OP is trying to figure out is why it's changing. Mine always idles at 600 as long as it's warm, regardless if I just started it up or not. I think the OP is trying to figure out a drop in the idle.
Throttle body is right on, forgot that one. if there's excess buildup it may have also contaminated the IAC.