Ok so Ive had this problem and kind of dealt with it but its getting worse. anytime I start my 1990 cherokee and start driving, about 30 seconds to a minute down the road when I let off the throttle my jeep stalls out and cuts off. I thought it was the IAC but I took it out and cleaned it (it was black but now its shiny) and its still doing it. also when it does die I have to put it in neutral and start it back then I have an idle of 1500-2500 which is way off normal. and it wont go back down until I put it in park turn the key off then crank it back up. any ideas?

 

Anybody??

 

Check constant fuel/spark.

TPS, CPS.

 

The cps could cause this? I have a spare in my tool box just in case it failed Ill go ahead and replace it.

 

tps?

 

are you asking what it is? or telling me to check it? btw if its the first one thatd be throttle Positioning sensor

 

my 98 jeep has the same problem. I connected a scanner to it while my check engine light was on and the tps sensor came up, have not replaced it yet till pay day on friday to many projects but so little mula"cash".

 

well thank you! cuz I have a Renix system so no codes for me haha just replace and guess =) and a little common sense.

 

well then, Good Luck on your guesses.

 

nice jeep by the way!

 

thanks ill try haha. oh thanks man!

 

I know you cleaned your IAC motor but try replacing it. I have cleaned alot of IAC's but didnt do any good. The solenoid still sticks! To me if you let your foot off the throttle the only thing controlling airflow is the IAC motor.

 

+1.

Once the IAC gets sticky, they don't always come back with cleaning. It does sound like an IAC issue.

 

ah ok. it most need to warm up because after a few minutes it works fine. ill be sure to replace it though next time I got $50