Throttle Position Sensor?
 

What are the simtums of a improperly installed Throttle Position Sensor?

Hesitation and stumbling while accelerating, engine running too rich, or too lean, it also has input into the transmission for shifting points. That's all I can think of off the top of my head.

What about a '99 4.0L idealing at 1500+ rpm?

Yep. That could be a symptom. I take it that the wiring problem you found didn't fix your problems.

Check for vacuum leaks. That could have your idle too high.

Still looking at the wire problem. Just it all started after we changed teh TPS

There's not a whole lot that could go wrong with replacing a TPS, unless you were unlucky enough to get a bad TPS from the parts house. Maybe you disconnected something along the way that you forgot to reconnect or knocked a vacuum line loose. That wiring thing sounds like if it isn't a problem now, it could soon be. Fix that and go over the connections.

Yep, that's the game plan for tomorrow..

I don't mind trouble shooting, but I have one of those brothers that only calls when he wants me to work on his XJ..

Did he ask for money, too???

If not, you're good. :thumbsup:

Nope no money he knows I'm broke. But I'm the mechanical one.

Instead of digging into it to much to day been on the net looking for the answer. I just don't feal like turning a wrench on my Birthday..

Happy birthday.

Get that worthless brother of yours to take you out for a steak!!! :p

TPS ended up being bad. Not just 1 but 2 were bad.

Jeep would ideal at 1200-1800 RPM, was just plan crazy..

So, now you're all good???

Very close t it. Now he's saying it has a cold start problem.. He has to feather the throttle to get it to start. I'm pulling what little hair I have on this one out.

Could be the O2 sensor if its a cold start problem

Well I got word from not it's very hard to start cold and idealing at 150 rpm...

This thing is driving me nuts..