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Strange running issue


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This is for my dads mj, 1989 4.0 auto 2wd.

 

It started acting up the other day, it will start off running fine. I was told it would occasionally die while idling (did not die while I was messing with it). While driving it will start off fine and can get up to speed. and then it seems it won't get the jeep over 20mph regardless of the amount of petal given. It starting working properly before I got home.

 

The engine is not idling rough

 

My current thoughts are

Grounds

ECU

TCU

Fuel pump

Fuel pressure regulator

IAC

 

The injectors where replace sometime last year. I am going to have dad and my brother do cruiser's ground upgrades and refreshing.

 

Any thoughts are greatly appreciated.

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