December 28, 201114 yr 2.5 w/ Autotragic trans. No codes. When cold it runs fine, runs ok until just about the time the ECU switches loops, then the idle starts going up and down, up and down, up and down. Only about 3- 400 rpms. Hasn't ever stalled. Sometimes it doesn't do it. Seems to do it less if the outside air temp is about 60F or more. ECT reading on diagnostic scanner is consistent with outside air temp when cold, rises accordingly as the engine warms, and compared and verified with an IR temp gun once the engine is warm. Checked for vacuum leaks, loose hoses, all that jazz, found nada. Removed the IAC and the O ring was goofed up (installed crooked). Cleaned it, (just sprayed it down and wiped it with a cloth) replaced the O ring, idle still fluctuates. Guessing the IAC needs to be replaced. Gonna clean the throttle body first (throttle bore is gummed up, the butterfly sticks to the sides), see if it helps. And a good Seafoam treatment is a must (plus it's fun ). Any thoughts?
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