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Hello. Welcome to Just Answer. Please allow me to assist you. You are correct, the 1989 Jeep 4.2 litre engine uses a fuel feedback system; this requires the use of an electronic control system on the back of the carburetor. (the system was no very good I might add). Any carb for this engine from the aftermarket will work for you, as long as it is for a pre-183 4.2 litre engine. I had the same issue on my 87 Eagle 4.2; the carb electronics wore out (there is a 'stepper motor' bolted to the back of the carb; this is what controls the air-fuel mixture). I replaced it with a carb from a 1981 4.2 and have had zero problems. This is what I recommend; get a carb for an earlier version of your Jeep.