HELP stumbling and hesitation issue

[jasonl2000xj]

I have a 2000 xj, I purchased it about a week ago. I'm having horrible stumbling/ hesitation problems. I've replace coils,plugs,iac, map, tps, crank position sensor and checked 02sensors.no change. The stumbling is completely intermittent. During its fits if I accelerate hard it usually goes away. My fuel pressure is about 45psi on the rail. Help!!!!! I'm about out of ideas..... I also sea foamed it and got no smoke at all. I also changed the coolant temp sensor. I find it's at it's worst in between 40 and 50 mph which is about 1500 to 1800 rpm's

 

[jasonl2000xj]

Could it be that my fuel pump filter is clogged or pump on its way out. Or possibly a failing injector? My plugs are white so I'm starting to rule out spark

 

[Tim_MN]

Test the fuel pressure. Test the fuel injectors. Inspect the wires and wire plug for the Coolant Temp Sensor specifically, and the other sensors also. Look for corrosion, loose or mis-aligned plug pins, and for damaged/melted/chafed wire insulation.

Did you buy genuine Jeep sensors ? At least once or twice a week a thread comes up where the original issues were not cured by a cheap sensor and when a genuine Jeep sensor is used the problems are solved.

 

[jasonl2000xj]

I will def look at all wires. All sensors are from jeep

 

[dennis461]

Test the fuel pressure while driving.
Difficult, but worth the effort after ruling out simple things.