We converted my wife's 86 CJ7 to a '92 model 4.0 L fuel injected engine about two years ago. Recently, it has developed an under load miss like when climbing a hill or cruising at higher speeds like 60 mph plus. Lower loads like accelerating away from a stop on level ground - no problem even under moderately hard acceleration. I have two inline fuel filters - one between the gas tank and the external fuel pump, and another between the fuel pump and the injectors. I have changed the one before the fuel pump, but noticed no difference in performance. I have also been putting Lucas fuel injector cleaner in the tank regularly. It starts and runs fine other than this miss - any ideas?
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