My XJ has had an issue for a while that for the life of me I cannot figure out. When I leave for work in the mornings or head home in the evenings, for the first min or 2 the XJ hesitates like it's about to die. I have to let off the accelorator then get back on it to keep it going. It never dies, just runs really rough. After a couple of min's it runs fine. If I let the engine warm up for a few min's before driving it it doesn't do this. I put a new TPS, IAC, and MAP sensor on it, which did not fix it. Any suggestions? Thanks.

 

It sounds like a fuel problem,not enough fuel. Try and turn your key on and off a few times to let the pump charge the fuel rail.
It could be the fuel is draining back to the tank when it sits.

 

check the pressure at the rail, and I dont know what year your jeep is, assuming its a 99 from your sig, then it could be the pump or a plugged up filter/sock