Hello again. Guy with the 48 buick here (Matt). I've noticed that the car idles very rough when it's cold. This morning it stalled twice before it caught it's breath. The guy said it could use a tune up. I've done a bit of googlight and i think it might be a little bit of a dirty carb? The car was only driven 400 miles in the last 5 years. I remember my grandfather said that when he drove his 66 chevelle that little the carb got gummed up and he needed to run a few gallons of racing fuel to clean things out and wake up the engine.

Any suggestions on where to start and steps to troubleshoot.

I saw a youtube video of a guy spraying carb cleaner into the float bowl then running the engine. Is that ok to do?