Engine Idle Drops A Lot in D

Worked with the timing a little more.

I think nm9stheham may have something with the PCV valve.

With the car in N, timing at 17° , 750 rpm the car runs 10-11 in of vacuum. At this setting the PCV is vibrating a lot.

When I put it in D from here the engine drops to 550 rpm and the PCV stops vibrating. Unfortunately I couldn't read the vacuum while in D and I didn't think about getting that reading.