You may have pressure, but to you have flow rate???

Some notorious issues with the 4.0l....

Fuel filter - The in-line filter needs to be changed on a regular basis.

Injectors - They also need periodic cleaning.

There is also a "throttle position sensor" that drove me nuts with my 89 Cherokee w/4.0l

It has been my experience the fuel pump can give good reading at idle and yet begin failing with the engine under load.

Last resort is the engine control module. But, with that dead, you will have no spark.

John Stewart
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