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Old 09-02-2009, 04:13 PM
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Keller Keller is offline
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Question Re: Missfire under light load when hot

Originally Posted by hoss109 View Post
It's also started upshifting to 4th directly from 1st on occasion. When this happens the converter also locks up.
Dollars to doughnuts it is your converter locking up incorrectly. The TCC switch in the trans may need replacement. Been discussed here many, many times. Especially if it feels as if it will not unlock when slowing down.

The misfire may be a module, coil pack, wires, plugs, etc. Maybe even a fuel problem. How recently was the coil replaced? Was it replaced with a GM unit?

Do you have access to a Casper's tester?
Scott Keller - GNTTYPE Founder & Moderator
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