Wilbur2001XJ

so this is the story. about a week ago i drove to work like usual no problem. about 4 hours later i went to go leave for lunch. i started the jeep up an it immediately dropped to about 250 rpm and stayed there. it seemed like it was going to stall out but never did. i proceeded to go for a drive and noticed that when driving normally everything was fine but when i would come to a stop the rpm would drop right back down again. i thiought the battery might be the issue (only a year old) so i took is to sears for testing. turned out to be bad. got home and installed a new one and everything was normal for about a week and then all of a sudden the same thing was happening at idle. when i rev it up to about 2000+ and let off it drops to 250rpm but when i just blip the throttle real quick it sometimes stalls out. i really need to figure out whats wrong to see if i can fix it myself. any help would be greatly appreciated! thanks

cascadeclimbn

Did you check your throttle position sensor?

Turbo X_J

Check the idle air control.

Wilbur2001XJ

i didnt check either what should i look for?

cascadeclimbn

you have a manual? i think you check the tps for voltage but it might be for resistance

Wilbur2001XJ

you dont think it is the alternator or anything do you because it starts up fine everytime and the battery meter is good. ill check the manual for that

Turbo X_J

Just noticed your sig, did this happen before or after the tune?

cascadeclimbn

doesnt make sense that it would be the alternator b/c it starts up and runs right? when you have it running do you notice power diminish? you can always take your alt. in to autozone to test it if you think that could be it

Wilbur2001XJ

no the power has been great and normal the only problem is at idle. and i have had the tune for well over a year now with no problems.

cascadeclimbn

so then it wouldnt be your alternator...its most likely a sensor

Wilbur2001XJ

i forgot to mention that this problem is intermittent. it has been going on and off for the past week. i never know when its going to happen. ok ill have to check the TPS then

cascadeclimbn

defenitely sounds like a sensor on its way out

Wilbur2001XJ

ok ill have to check tomorrow. thanks a lot for your help! greatly appreciated! ill give and update tomorrow