Hey guys this is my first post and I have been reading here for a bit. I have a 99 cherokee with a 4.0. It has a stalling out problem when you first start the jeep and take off, if you mash on it and clear it out you dont have anymore problems with it what so ever. I am wondering if its the fuel pump because if you hop in and crank it over it wont start right up but if you turn the key on for a second it will fire right up. It also seems to have a little bit of loss of power. Also I need an exhaust for this jeep do i have to keep the stock exhaust with the cat, I think the cat is plugged possible as well thanks guys.

 

Ya sounds like the fuel pump
Oh and WELCOME TO THE FORUM!

 

are able to test the fuel pressure? data is always helpful in order to diagnose an issue

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change the fuel filter first.. if that doesnt help you'll probably be looking at the pump.