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well gee, there are 50 reasons. did you scan the PCM yet, if not ,why not? when the idle surges, that means. NO RPM ranges stated, if super low rpm check EGR.
1: engine lean and ISC dead, or cant handle the huge engine power drop..The PCM can even make this worse!, buy hunting the ISC to find spec, idle and failing... to... 2: or any of 50 other things causing huge engine power drop and PCM can't maintain idle controls. super lean burn.(bogging) super rich burn, misfire for 50 reasons.
i cant hear your engine,nor feel it, or see it shake from gross misfiring. no can i drive it and see/feel power loss, can I? asking net bunny's this (blind as bats) is "OVER THE TOP" no? so here , ill toss the dice for you and guess gross misfiring. ever get a tuneup this decade, if not bingo , no?
and the others...
http://jeepdied.com/Misfire101.html
link even has the 50 cause list, to show the futility of guessing! we do 1 to 10 tests. and find it. for sure.
as you can see EFI systems are complex. gue$$ is not only expensive but can net you 2 problems easy.
It likely has EFI (electronic fuel injection) and an idle air control valve that regulate idle speed. They can get gummed and fail to have a fast idle when cold, or get stuck the other way, and have a too fast idle all the or regularly take its time slowing down after you take your foot off the gas. An engine temp sensor can also cause a lingering high idle if it reports the engine as still being cold after warm up.
Could be a vac leak, or a dirty throttle body, or a faulty idle air control valve. The computer controls idle speed by regulating the amount of air into the intake. Could also be something pulling on the throttle cable such as the cruise control.
If it tends to cut off when no gas given but sometimes idles up very fast & then slows back down, probably the idle air control valve. If so, will have to be replaced to fix.
Change/thoroughly clean the idle control solenoid. It may be sticking and causing rough idling.
Cleaning it is unlikely to be more than a short-term solution.
Usually with the AC on, the idle will slow down, but your case, maybe you set the idle too fast, try set your idle slow down a little bit see if it is working.
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