Re: Sudden idle problem
 

I just pressed the gas pedal all the way in to open the throttle during the compression test. But, I was just now out there checking for vacuum leaks again and the problem seems to be gone.
I still think its idling just slightly high but without a tach I can't say for sure. Its very smooth though and the vacuum reading stays right at 21''. Maybe the engine getting up to temp made it
go away and it'll come back once it cools, we'll see.

Re: Sudden idle problem
 

I have gone through this twice with my 327/Edelbrock-Carter/HEI. I get the rough idle but cannot find any reason for it; then is goes away.

Please let us know if you find something; I will likewise.