Am I crazy or what???

Think I got it, timing up to 12 degrees btdc helped the low idle in gear vacuum, but the culprit was a stuck or sticking primary throttle valve. It went into its surge issue after running 10 minutes or so, took off the air cleaner and tapped on the valve body covers and zoom, the left one was periodically sticking closed. So far so good, got the idle in gear vacuum up to 12 in hg and the mixture screws back down to 2 1/4 turns. Thx for the advice, be up in yer neck of the woods over the 4th of July.