high miles and blow by gasses can build up...dealerships charge to clean and service throttle bodies...
also, make shure pcv is clean, etc...
also
everyone should have a manual for their vehicle, and a professional shop manual should be available at the library in the reference section--you can make copies of the necessary information...good luck :)
Your 1990 would have throttle body injection, not a carburetor.
check your Idle sensor which is attached to your throttle body. This ussually goes bad and tends to rev the idle up. I had the same problem with my 99 wrangler.
Check your Throttle control sensor... mine does the same thing Check your Throttle position sensor... mine does the same thing
unrestricted airflow into the intake. Check your throttle plate and associated sensors. Also gas pedal or cable may be binding or stuck holding the throttle open.
No, it will not.
Easiest and cheapest trick is the good old 02 sensor -OR- Make sure that the throttle body isn't coked up with carbon as they can do that.
My jeep wrangler keeps loking in gears
The TPS (throttle position sensor) would be found on the throttle body on the opposite side of the throttle cable.
Possible faulty throttle position switch, idle control valve or dirt / scum in the small galleries of the intake / breather to throttle body pipes, did you get an engine management light come on when this happened? possible fault code retrieval to help diagnose prob'.
That would be throttle body injection (TBI).
Your TPS is located toward the bottom of your throttle body. If lucky, you can remove it with an offset screwdriver, otherwise you will need to remove the throttle body so you can turn it over and have access to the TPS. I had to unplug my MAS, EGR, IAC, and TPS, remove the air inlet between the air filter and throttle body, remove throttle cable mount and remove two brackets, 1 under and 1 behind the throttle body before it would come off and allow access to the TPS screws. A lot of work for 2 little screws. If there is a simpler solution out there, I would really love to hear about it. I would rather work smarter than harder.
The TPS (throttle position sensor) would be found on the throttle body, opposite side the throttle cable is attached to.