idle up down
 

finally got my 95 mx-3 to run does great sitting in the drive way except the idle is up down up down between 800 to 1100rpm also when i drive it down the road it gets to about 2000rpm and looses all rpm back to idle speed till i give it just a little gas then it jerks ya back till ya hit that spot where i leave the pedal in the same spot then just drops out agai any ideas would be greatly appreciated changed the distributor, plugs, wires, battery,fuelpump and filter oh yeah the car had been sitting for 4 years

RE: idle up down
 

I would check intake boot condition and make sure your ISC/BAC (idle valve) is operating correctly. Pulled any codes?

RE: idle up down
 

sounds like the MAP sensor to me. common problem i am coming to find.

RE: idle up down
 

no map sensor on this model i think only the mass air flow and i have cleaned with carb cleaner and blew out with air, dont know about the idle valve unless your talking about the throttle position sensor and i don't know exactly how to check it.

RE: idle up down
 

I would check a WSM if you can find one...or if you can pull a good throttle body somewhere and swap them out, so you wouldn't have to recalibrate the TPS and the ISC/BAC valve is attached to the TB.

One thing you can check to see if your valve is bad is disconnect it while your idle is loopy. If there's no change, you know it's bad.