Engine Cutting in and out

[Ghost89]

I have a troubleshooting question that perhaps you can assist with. The 4.0 engine in my 1989 MJ has been experiencing performance issues lately. Once the engine warms up, it begins to sound like it's losing power around 2,000 RPMs. I initially suspected the TPS or ignition coil, so I replaced both yesterday. However, the problem persists.

[Ghost89]

16 minutes ago, Ghost89 said:

I have a troubleshooting question that perhaps you can assist with. The 4.0 engine in my 1989 MJ has been experiencing performance issues lately. Once the engine warms up, it begins to sound like it's losing power around 2,000 RPMs. I initially suspected the TPS or ignition coil, so I replaced both yesterday. However, the problem persists.

It sounded to me like an an ignition issue as the power loss sounds like the engine is cutting in and out. 

[Pete M]

have you accomplished all of Cruier54's MJ tips?  most cover the common wiring issues.  all should be accomplished even if one fixes the current problem.  you can find his stuff at the top of the link in my signature.  

[cruiser54]

Tips 1,3,4, and 5 right off the bat.

 

Plugs, wires, cap and rotor are due every 30,000 miles. 

[Ghost89]

Replaced cap and rotor along with plugs, and wires. Then came the lag and now I replaced ignition coil and TPS. Onto cruiser’s tips ! Appreciate all the advice