1996 V6 Ford Contour - when started cold is cycling from 200 rpm - to
3000 rpm on its own (sometimes it stalls at the low end). Once warmed
up it seems ok, but a few times has stalled and would not restart until
cold (or at least cooled off a bit), but it does not seem to be overheating.
Any suggestions where to look first (and second and third)?
Check the 1/2" more or less molded air line below the throttle body
for a soft spot that collapses under idle vacuum, choking off idle
bypass air. The IAC opens up trying to maintain RPM, the engine looses
vacuum due to almost stalling, the hose opens up, and the RPM goes up
untill the IAC backs off again and the cycle repeats.
At least that's what caused it on mine. I found mine when the hose
finally cracked making a vacuum leak (which then whistled). Found it
when it started throwing codes.
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