Stumbling

[Ackattack]

So I've been using my 69 GMC to run to the parts store / home depot / what ever occasionally.

Generally speaking, it starts up pretty easily and runs good for awhile.

After awhile after it's gotten a chance to heat up, when you pull up to a stop sign or whatever, when you start going again, it really stumbles and doesn't want to go for a few seconds. Once it gets going though it's fine.

It will do this when the coolant is hot, but if you let it cool for about a half hour, and start it back up, the coolant is cool, but it will still do it.

Before I start throwing parts at it, I wanted to see if anyone had any ideas on what to check. I'm thinking it's the ignition module and/or coil (it has an HEI dist.). The engine is your basic old 350 with a Edelbrock carb (manual choke) and a 4 speed manual.

I checked the vacuum line from the carb to the distributor, and the distributor is advancing the timing as it should with the vacuum.