Quote:
Originally Posted by ghill901
the timing is what i thought was off also, I had the timing adjusted but still the same rapid knocking noise. Also when i decellerate my truck backfires. it sounds like it is coming from the carb itself. What controls the spedometer cause when i hit 60mph the needle goes crazy and drops.
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I would look for a lean mixture as well.
The speedometer is run by a cable coming from your transmission. If it works correctly up to 60, it's likely the speedometer head (the part behind the dial you see on your dash) needs to be repaired.