Engine Idle Shake

ant72 said
I'll check the motor mounts, in gear the idle is 700 RPM out of gear 1000. I have the timing set at 20 degrees initial. The trans has a 2200 to 2400 RPM stall but it may be to tight for the cam in the car, which I don't know what it is. The motor makes between 12 - 13 Hg out of gear and drops down to 7 - 8 Hg in gear.
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That's a large drop in rpm.
I agree with check the spark plugs first. See what they may tell.

My guess, and its just that, a guess...
One possibility is the plugs are carbon fouled, possibly from too rich for some condition, and now its built up.

What cam?
And at what rpm was the 20* initial measured at?