97x 4.2L misfires under load - The Saab Link Forums

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Old 03-03-2013, 07:27 AM   #1
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Join Date: Mar 2013
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97x 4.2L misfires under load

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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Old 03-03-2013, 07:41 AM   #2
 
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Join Date: Mar 2004
Location: Boston, MA
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You might have better luck on the TrailVoy forums...They're a good resource for the GM powertrains...
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