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Re: 4.3 vortec V6 running terrible
Fresh Gas. For that matter, any chance that bad gas could have caused the original misfires?
Couple of old school suggestions:
Run it in a really dark place with all lights off and your eyes adjusted to the dark. Look for any ignition electrical juice escaping wires. Or any other sparks from a loose connection.
After a bit of running, pull the plugs and examine. If 1 or 2 look different then the rest, give everything about those cylinders a close look. Plus check the plugs for an obvious way lean or way rich condition.
Verify your voltage is proper. Computers really don't like out of range voltage.
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