Vacuum leak, get a can of carb cleaner and give it a quick spray into throttle body you will notice a change in the rpms. then spray it around the outside of the throttle body and on the vacuum hoses, if the RPMs drop again that is where the leak is.
A quick fix is to look under the hood, look for where the intake meets the throttle body, you will see a bolt which can be adjusted. When you start to screw it out, your idle will decrease...
SOURCE: 1999 jeep wrangler heater blower
you need to change the resister block for the fan. it is located on the heater duct near the fan... there is a connector on it and two or three screws holding it in.
Robert
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SOURCE: will idle high sometimes up to 3000 rpms when driving or sitting still
I have the same Jeep and same problem. The engine was running rough. The Jeep dealer fixed a vacum problem in the manifold and they then decarbonized and cleaned the fuel injectors. After these repairs the idle problem began, it would spike to 2000 rpm while sitting at idle, sometimes it would slowly come down, sometimes I would have to tap the accelerator. I took it back in and they then replaced the throttle motor and reprogrammed the PCM (Power Control Module?) Still same problem. Now they suspect a another vacuum leak and I am taking it back in on Tuesday, will let you know what happens, $ 1,300 so far.
SOURCE: Jeep Wrangler 6 cyl. idles up and down
Have your oxygen sensor checked, one of the symptoms of a faulty oxygen is an up and down idle.
SOURCE: 91 Jeep wrangler New everything idles rough, no Power then dies
you check for miss how is compression
SOURCE: i have a 1988 jeep wrangler that won't idle.
1. check for vaccuum leaks.
2. check for a check engine code
3. check the throttle body/butterfly plate for carbon build up.
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