i have a 1990 xj laredo .my jeep is runing funny when i go 15-60mph it revse high and it feels like it has no power.i changed my trans fluid and filter about three weeks ago and the magnets were clean.its like when i take off it has to stay reved up high for it to go .but if i stomp on it it goes .this only happens in drive.and its not somthing that gradually started happening .it just started this morning. i just cleaned the throttle body and its still doing it and i found a cracked vacum hose i fixed that to but it still keeps doing the same thing.

 

What trans fluid? What is the fluid level?

 

is it automatic or manual trans? any other symptoms you may have noticed?

 

this might sound daft but check you dont have a brake seized up

 

fluid level is good and it calls for dexmerc fluid. i have an automatic trasmision.

 

its an automatic trans and it doesnt rev up
by itselfe its like it has only one gear .

 

is it shifting gears or is it stuck if first?

 

it feels like its stuck in first but i cant really tell it only switches gears after 4000RPMs

 

Check your TPS. It actually controls your transmission (no one said Jeep designers were smart). There are many write-ups. Try this one. http://billyxj.tripod.com/SENSORS1/index.html

 

i just took a look at it but idk how to tell if its bad so ill try this

 

Sounds like your Throttle Position Sensor. Make sure you always disconnect the negative battery cable before working on your baby. It senses how easy your pressing on the pedal and shifts accordingly. When you floor it, it senses it and down shifts On easy acceleration it shifts up for cruising. My jeep wouldnt start one day and I started messing with wires. I unplugged the TPS and plugged it back in checking the terminals. When it started back up it wouldnt shift without flooring it rpms reaching 4500. After the new TPS it started shifting normal.

 

i guess my tps is bad cause i cant even set it

 

thats exactly what its doing .do i have to set it when i get the new one and if so can you tell me how.

 

thanks i changed it problem solved.