Question about 1998 Chevrolet Tracker

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Tracker 1998 fluctuating idle

Hi, I have a 1998 4wd-4dr 4cyl Tracker- purchased it new- it has about 97,500 on it now- NEVER had a problem-all I ever repalced was a $10.00 temp A/c switch in 2007-tires of course- fan belts-plugs & wires. I started her up the other morn (22degrees out) and it warmed up as ususal, I noticed that the rpm's were dropping a bit below the on dash guage-looks about to below 900 and the engine would stutter and then the rpms would pick up by itself to the normal just below the "1" - when i put it in Drive-rpm's dropped- by stepping on gas they came back up- she's been faithful to me- so not to breakdown on the street- i took my other car- Started Tracker up the next day -same thing but not as bad- I have't cked anything in detail yet -it's been too cold here with snow storm -but a quick look under the hood- things looked ok- I suspect maybe some type of sensor or module- or maybe it's time to overall routine maintenance? No new gas-Gas is at 1/2 a tank at regularly used station i'v been using all week- It's ALWAYS run smooth-It's my daily driver- appreciate suggestion-I do have a Haynes manual- Thanks a bunch

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This time do the cap and rotor with the wires and plugs.
or just the cap and rotor , if wires are below 30K miles.
plugs are cheap $1.50 so put in some new ones.
and the filters , air and fuel.
the key thing was , the fast foot trick

if the car runs ok and idle messes up.
then the ISC might be needing to be cleaned.
Idle speed controller.

if your getting misfire on hllls, that is ignition tune up.
idle out can be tune up or ISC sticking.

hope i have helped you.

Posted on May 01, 2009

  • jerry Hodson May 14, 2009

    clean the ISC valve.

    http://www.kick-fix.com/

    see idle here.


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