Harms Rebuilt '71 Thermoquad - Wondering Idle, Stalls when Put in Gear

66Valiant528 said

I'm thinking the high idle is starting to pull advance . Check your timing at idle. Should be rock steady. If mark jumps around make sure your advance springs aren't stretched or too weak .
And putting your hand over carb and idle increases is an indication of a vacuum leak. Could be a leak on the bottom of the intake runner to head port. WD won't find that.

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Timing was steady at idle, maybe plus or minus 1/2 degree. I had a vacuum gauge hooked up to both manifold pressure and the carb advance port time. Manifold was 9-10 and fluctuating, vacuum port pressure was 0-3 degrees depending how I was playing with idle screw but even at 3 degrees, timing was steady and did not move. Advance started pulling in when I got to about 5 inHG at vacuum port.