I have a 1990 Jeep Cherokee with the 4.0. I have replaced the computer, icon,coil, and distributor. The jeep will start and barely run and it won’t stay running long enough for me to even move the thing. I can get it to rev up but it won’t stay running once I get off the gas. When I unplug the idle air control valve and the tps sensor it doesn’t affect the way the jeep runs what does this mean and what could be causing it?

 

low fuel pressure perhaps.. could be glogged fuel filter if that hasnt been replaced since 1990, just a suggestion

marc

 

Could be a faulty hose/pipe from the throttle body to intake manifold also.

Time to TEST things instead of firing the parts cannon at it.

We can guide you through the test procedures.

Here's all you need for now: