SOURCE: my 1992 3.2 petrol trooper starts an idles fine
check for spark at the coils under load. May have to change some ignition coils.
SOURCE: idle problem: motor revs up and down at idle
it sounds like your idle control valve needs cleaning or replacing
SOURCE: saab 9-5 need to give alittle throttle for cold engine start
the idle air control valve may be bad or just needs cleaned out. idle air control valve acts the same as a choke. if it is messing up it will cause engine not to run right.
SOURCE: 2002 Hyundai Elantra 100k miles - 2.0l - running rough
When I had this same problem...it was the Catalytic Converter...cost about 200 to get it fixed at the Hyundai Dearlership :)
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