Quote:



Imediately upon hooking it up, the idle raised a bit.



I am by no means an expert on vacuum advance, as is evidenced by my own thread on the subject. However, your comment indicates that you plugged into a full time vacuum source instead of ported vacuum. The guys who responded to my questions say I should connect to a ported vacuum source, which supplies vacuum at part throttle, not at idle. This could be why you are getting the pinging.

Unplug the vacuum advance, bring your idle back up to a baseline, find a ported vacuum source, and try again.