allstockracer

I have a 88 Cherokee with a straight 6 in it. It had an alarm it that malfunctioned and screwd some stuff up. I had to put a new ignition switch in it to get it to start. Now it runs and drives fine. I have changed the TPS sensor and other little odd and end things. Here is my problemo. When I drive the jeep normal it runs great. Once I hit 65 MPH or so it starts to hesitate like a lack of fuel or fire. Also if I Open the throttle all the way it does the same exact thing!!! As long as I dont floor it or go over 65 it is ok. Please help. I love my jeep but it is making it rather difficult to trust it off road.

BuckB91XJ

Sounds like fuel pump is going to me. Put a test pressure gauge on the test port on the fuel rail. With key on and pump primed you should have 30 PSI. Anything less and it is bad. If you think it's the fire side of the house. Remove your coil/ignition module and take to your local autozone and have it tested for free.

allstockracer

Well actually at first we thought that is what it was. So we changed the fuel pump, so its brand new. When ever we took the alarm out it started doing this.. We had mechanics look at this and they were stumped. The alarm was making it to where it just wouldnt start at all. We replaced alot of parts to find out that it was a wire issue or alarm. We took the car to a mechanic to have the alarm removed. He was the one that got the car running by just removing th alarm. When I got it back is when it just had this stupid hesitation that he cant figure out. Im assuming that what ever the alarm was hooked to got messed up. The question I guess is what is it?

allstockracer

ttt

BuckB91XJ

If the alarm was hooked to something to make the Jeep not start. I would say that would have to be the coil or ignition module. Did you ever get those parts tested and verified good??

ColoradoJeepXJ

To me it sounds like an air issue. Not enough air in or to much back pressure. Check your air filter and catalytic converter.

Howler_GT

Replaced pump....
Did you replace fuel filter?

I assume this was not a "factory" alarm system.

Have you removed ALL of the offending system, wires included?