Quote:
Originally Posted by HO455
This is usually caused by the mechanical advance weights not returning completely every time. To verify this install your timing light and while watching the movement of the timing mark Rev your engine. Vary how quickly you Rev the engine and down. The timing should always return to the same number at idle every time. If not the changes in timing at idle are causing the idle speed to vary.
This is usually caused by weak or broken springs, and/or rusty or worn weights that won't travel freely.
Good luck with your truck it sounds like you have several issues to locate and correct. Please keep us posted on your findings.
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I'll check that out thanks a ton.