why do i have a really low idle?

[Legacy]

i own a 1991 xj 2wd fule injected, for the last 6 months its had a low idel well i'm sitting in traffic one day it died on me and did want to start. i replaced the o2 censor but with no luck it still has a low idel.
I'm not sure what my next step should be?
should i take it and have it tested?
thanks for any help.

[96XJCLASSIC]

Not exactly sure but it might be the TPS (throttle positioning sensor). Cherokee's are know for having problems with the TPS. Had to replace mine a couple months back. It was not shifting correctly and it idelled at like 300 - 500 rpms. Not sure but that is my opinion. NICK

[Greg Smith]

Try cleaning the throttle body. Greg

[Legacy]

thanks, i'll check it out.

[RINGKONG]

TPS is a good place to look and be sure to check the IAC valve, make sure it is operational and not sticking.

[Centrevillemx]

Stuck throttle cable perhaps??

[Legacy]

how hard is it to replace the tps?
when i'm replacing it is there any thing i should watch out for?

[Legacy]

how hard is it to replace the tps?
should i just go and buy one from auto zone?

[ssnsltd]

Check
Here (http://www.autopartsgiant.com/cj/?AID=5434823&PID=398064)

they have them for 1/2 the dealer cost.

As to changing them out:

TPS (http://autorepair.about.com/library/faqs/bl608e.htm)

[Legacy]

i checked out both links, but the TPS is for standard tranny and i have an auto.
thanks

[ssnsltd]

Check here (http://www.wagoneers.com/XJ/digests/XJ-v1-1200/xj-digest-v1-1208.txt) for adjusting the with auto trans.
It is about 3/4 down the page.