Runs like on 3 cyl, help if you can.
So here is the situation. I have an 89 wrangler with 4.2 and its manual. Was having some backfiring issues last year and then she finally died one night. Turns out there was some sensor, computer issues that was messing the carb up. So I replaced the complete exhaust ( cats were destroyed), replaced the carb with a weber 36, did a nutter and removed all the smog stuff. Ran beautiful for months. Then one day I come out of work and it runs like its on 3 cyl, will barely move on its own power and shakes horrible. Didn't have time to work on for for a while but would start it up now and then with same result. One day a couple months ago I started and it ran fine. Wife and I took it around the block a few times with no problem. Parked it started it severl times since with same rough runnin issue. Does it sound like something in the ignition? Maybe the ICM? Thinking of putting a D.U.I on it if it seems to be ignition related but the the reason I am leaning to that is that the one day it ran fine. Any thoughts or suggestions?