99 JGC will idle in Park, but not in drive or Neutral

Asked by Nov 20, 2016 at 01:20 PM about the 1999 Jeep Grand Cherokee Limited 4WD

Question type: Maintenance & Repair

I just did a ton of work on my Jeep last
week, it idled fine ! I replaced the idle air
control and throttle body, brand new spark
plugs, air filter, thermostat ext. I need
answers because it's very frustrating to
drive with both feet to make sure my
engine does die while I'm idling at a stop
light. It usually idles around 600-800 RPMs
while in park, but idling around 300-500
RPMS while in drive or another gear. If it
get below that, the jeep will shake and then
kill the engine.  Could it still be processing
all the work I did on it? Even though I drove
800 mile trip ?

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