1999 Cherokee classic 4x4, auto, 4.0
Yesterday while driving, once I hit 50mph, my engine started sputtering and died, pulled off the road, restarted it idled fine, got back on road, hit 45-50mph, same thing. Pulled into parking lot, popped hood, didnt see anything unconnected or out of place, so i restarted it and got back on road. Hit 35-40 mph, same thing. This time when i restarted it, it had a rough idle, so bad that it was almost dying, and if i tried to put it into gear and go, it would just die.
Got it home, started messing around today, cant seem to figure it out.
It seems it only does it when its warm. I can start it right up and drive it up and down the street with no problems, but it seems once its warmed up and i hit 30mph, it dies.
Ive read on here about the IAC could be bad blah blah blah I HAVE SEARCHED.
I noticed that when it is warm and idling roughly, I can hear a strong sucking almost like its sucking in a crazy amount of air. I have NO idea what is going on here. Any help is GREATLY appreciated!!!!!

 

Is it throwing a check engine light? If so get it read at The parts store and report back.

 

check your wires running to your cps. If the wires are too close to the exhaust manifold they can get hot and cause the cps to malfunction once they get real hot. Had this problem on mine, re routed the wires to the cps and I've had no issues.

 

vacuum leak?