Why might a 1991 Eagle Talon rev up and down while idling?

AMMEND:

I will try adjusting the idle screw tommaro.. but i have the same problem.

As well as an srs light.. But i tested with a voltimeter, the ohms and such on the throttle position sensor..above the Idle Air Controll..

not much on IAC recommending its bad.. TPS made things go click near the fans and such.. i know this also controls fuel, maybe that was one of the 3 clicks..

fans don't work.. but worked before i let the car sit for a while.. i have yet to hard-wire them..nothing to do it safely really.. I'll expand more when i get fourther..

ANSWER

if its an automatic pull up the hand brake and place the car in drive and then get a Phillip screw driver and right where the intake tube begins from use the screw driver to adjust the engines rev from going up and down. Same for manual transmission has well.

On mine there is this connetion on the throttle body, one geen wire and plug, and it was found to be faulty. When it was unpluged the revs stopped and i found no differenc in fuel or running order on the engine.

The problem your having with the idle surge is caused by your air idle control servo, either it's dirty or its bad, it's a little cylinder looking object underneath the throttle body, it a very common problem with eclipse talon and laser, generally the turbo models, I've seen it many times at my shop, we specialize in dsm's, "diamond star motors" that's why your idle goes up and down, and the srs light is your air bag light, means its either disconnected or bad, and for your fan, start with the fuses and relays, sounds like a blown fuse, cause the tps, or throttle position sensor, which is the little black sensor on top of the throttle body with a plug on it, only tells the computer how much throttle your using that way the ecu knows how much fuel to use

AnswerThe idle is set too high. Lower it using the idle adjustment screw. If the idle gets too low when the up and down reving stops, your idle air controller (IAC) is defective, either replace it or just leave it, it shouldn't cause any other problems.