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1990 Cherokee 4.0 backfire misfire help.

2K views 11 replies 5 participants last post by  Alfred W. 
#1 ·
Sorry for the long post but I’m about to scrap this if I can’t fix it.

I have a 1990 Cherokee Limited with a 4.0, automatic with 130k miles. And I am having problem with it backfiring when I let off the gas when driving. If I rev it up in neutral it also hesitates and misfires/shakes badly. The fuel economy is also bad, I was getting about 16mpg now I’m getting 12mpg.

This is a list of what I have replaced recently.
Exhaust, from the manifold back including new converter.
O2 sensor
Intake/Exhaust manifold gasket.
Fuel filter
New distributor, distributor cap, plugs, wires
Water pump
Radiator
Harmonic balancer pulley.

I replaced the distributor because the old one was oscillating badly when running. The remanufactured one I put in still oscillates but not nearly as bad. I just got another remanufactured distributor to replace the other one thinking that’s the problem but haven’t installed it yet.

Any and all help is much appreciated, Brad
 
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