Need help with engine problem

[drdave69]

Eric, I adjusted the mixture screws to achieve the highest vacuum at around 13 - 14 inches. I printed an instruction sheet on how to set the choke and fast idle cam. I'll get to that the next time I work on it.

I put the 3" side pipes back on it and drove it a little while this evening. While it will idle when warmed up it still doesn't want to when cooled down a little and it still has a little "run on/dieseling" when turned off. I may play with the timing in 2 deg increments to see if it helps any.

Jason, the tach is the original (I assume) and it appears to be mechanical. The 502 has the factory HEI. I have replaced the coil but not the module(s) in the body. Is there a way to test it/them? As you stated would a bad module(s) cause the poor running characteristics or would it cease to run at all?

Thanks for all the help guys. Hopefully I can figure this out without having to find somewhere to take it.

[napa68]

The module controls dwell. Bad modules, while often just stop running, can cause a variety of other issues. They also too, can be heat related (heat soak)

Tim