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97x 4.2L misfires under load

2K views 1 reply 2 participants last post by  mike saunders 
#1 ·
About a year ago got code for throttle body and thoroughly cleaned it and codes cleared. Now I have a misfire/chug/jerk under low speed acceleration, steep incline, or under heavily loaded vehicle. NO codes show up. I have replaced plugs with iridium plugs then replaced every ignition coil one at a time, then replaced plugs again. I re-cleaned the throttle body and cleaned the mass air flow sensor. I even had the automatic transmission flushed. I've found No vacuum leaks. I can't spot any bad connectors. running out of guesses. Any ideas or way to find problem? I have OBD II but unsure of factory settings for comparison.
 
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