1990 Cherokee 4.0 backfire misfire help.
Hello all, first time posting here and need a little help. Sorry for the long post but Iím about to scrap this if I canít 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 Iím getting 12mpg.
This is a list of what I have replaced recently.
Exhaust, from the manifold back including new converter.
Intake/Exhaust manifold gasket.
New distributor, distributor cap, plugs, wires
Harmonic balancer pulley.
Battery with new ends
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 thatís the problem but havenít installed it yet.
Any and all help is much appreciated, Brad