My 1999 Cherokee Limited, 4.0 liter automatic stumbles and/or hesitates at tip in after you first start it when warm. It acts like an engine with a carb that has a bad or improperly adjusted accelerator pump. It only does it once when you start it and then it drives fine until you shut it off and let it set for twenty minutes to an hour. This symptom does not happen when the engine is overnight cold. It has 134,000 miles and has been serviced at the same shop for the last eight years. My mechanic had previously replaced both Oxygen sensors as a result of a check engine light. While looking for the cause of this sympton he replaced the MAP sensor, found a cracked coil, bad plug wires, checked the fuel pressure and decarbed the engine. I have cleaned the throttle body, the IAC pintle and it's port, installed a new TPS and then cleaned the IAC, TPS and MAP sensor connecters with Moller-Stephenson Contact Re-Nu. The check engine light does not come on an there are no fault codes stored in the computer.

SOURCE: stalls and backfires 1997 jeep

you need to check the fuel pressure,and did you mean you replaced the distributor or just the rotor because inside the distributor is a pickup plate that some times causes this also 02 sensor can cause this.is your check engine light on if so go to chain auto parts store they usually read your codes for free.

SOURCE: Swaped stock 4.0L with a 4.6L Stroker, engine only idles

let me know if it works out

SOURCE: 1996 jeep grand cherokee limited. engine is

You should have someone sing a dual trace lab scope, look at the Crank Angle Sensor (CKP) and Cam Angle Sensor (CMP) signals to check quality and sync.

Loose timing chains or broken flex plates can change the sync signal to the Powertrain Control Module (PCM) and cause a stall situation. Also you should have someone load test the battery and check the cables for corrosion. If the battery drops excessively during startup, the idle motor stepper count can be lost, Powertrain Control Module (PCM) will relearn it while driving.

Clean the throttle blades and adjust minimum idle.

With the air cleaner assembly off, hold the throttle wide open and look down the throttle with a flash light. Look at the lower intake plenum gasket for leaks, oil will build up around the edges and in the corners.

Perform distributor sync adjustment. I hope this helps. tried my best.....

SOURCE: 95 2.5 jeep wrangler stalls consistantly and will

I had the same issue with my 4.0, I went through all the same BS you did and in the end it was a faulty fuel pump. Pricy i know but im sure thats your problem

SOURCE: jeep fast idle

check for broken pcv valve