Am a new member, just bought a 98 Cherokee Ltd with 127K. Great vehicle except for one thing, when you start it from cold, engine fires right up, but then when you start to drive, it stumbles, acts like it wants to stall, then surges and bucks. After a few minutes, it smooths out and runs fine. Took to mechanic, who installed new fuel pump and did fuel system flush. Runs a little better, but is still stumbling until warmed up.
Any ideas?
Thank you.

 

Check Throttle Position Sensor and Crankshaft Position Sensor.

 

X2 and also o2 sensors.

 

Not the downstream one. Just the first one.

 

doesn't really sound like a CPS, usually when that goes the engine actually shuts off

 

Yes and no, when its on its way out it will cause improper fuel/air and spark issues. When the CPS is completely shot the vehicle will not run.

 

Thanks guys, I will take your suggestions to the mechanic. Will let you know how I make out, to add to your considerable knowledge!