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i have just done the same swap and had the same problem. It is almost a sure bet that it's the dizzy of out 1-2 teeth . mine was off 2 teeth advanced would idle perfect but stumble and back fire like a mother over 1500 rpm . worked like it was on NOS if you just mashed the pedal .It took...

you may have to drop the case out and see if the hole elbow came out or if it just rotted off . either way i would fix it up if you off road alot just to keep water and crap out .If you plug it off when the t-case lube warms up it will build presure and may push out past your seals . It...

This is my 88 MJ it started out as a 2.5 2wd then i got ahold of it :confused1 Then i stripped her down to the bare frame and cab and put an 87 XJ under it :shocked: .I am working at fixing the metal box to put back on right now .then a plan to lift it a bit more and lockers front and back with...

no they are no set up that way i just lost the oil pump on my 4.O MJ and it never lost its fuel but it did toast the road bearings lol so i swaped in the motor from a 91 H.O XJ . I would also check to see if you are getting proper fuel presure have you recently over heated it...

I have an 88 mj and as far as trailing it will go more places then my old xj i belive mostly due to the rear being so light . We have a small mudding group and the xj just can't keep up even the guys running big chev's with 38's are amazed buy my little mj .My friend has a late 90's xj and it...

you must have (start)an account with a photo hosting site such as photo bucket . then upload your pics to that site there you can generate the url codes for message boards then you just have to copy and past the code on to the message board ........ heres my 88 mj

well got it worked out it was the distibutor . we just took out the hold down bolt and started it up then clocked the cap back and forth till it worked properly . then just pulled cap of maked the position and had to move it 2 teeth works perfect now thnx a bunch

ithink it is fell right in place and rotor was pointing it same direction but may be off a tooth ahead one maybe ?? if you try to drive it normal it back fires bad but if you mash it to the floor it work like its on NOS ???

I just swapped a 91 H.O engine block and head in too my 88 MJ . I switched the intake and all sensors, distributer and fly wheel . It starts fine and idles normal but has a bad stumble and back fire between 2-3000 rpm blew the muffler in two . Once past that stumble area it works perfect ...