[snowball]

Thanks D13,

So a little more history, new GM crate motor was put in last year. New plugs and wires were installed at that point. Not sure if they reused the distributor, but that was replaced a few years ago. I will pull the spark control and check the ohms on the pickup coil.

Vacuum read 20" at idle. steady until it starts loosing RPM.

I'll pull and clean the IAC.