Missfire?
96-99 5.7 vortec engines had a sticky exhaust valve problem creating the symptons you described. If you still experiance the problem you might want to look min this direction. Ron
Tite Valve Guides
I chased a missfire for about a year that would occur under a load, most of the time on accel onto a parkway. Turned out to be tight valve guides causing the exhaust valves on certain cylinders to hang open momentarrilly and then return to normal. The check for this was to...
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