I've got an issue with a `69 Q-jet where the engine surges up and down at idle. The car is pretty cold blooded but the choke and fast idle work as they should and for the most part the car runs strong but this slow up and down surge definitely isn't right. Any suggestions? BTW, it's on a `69 RAIV GTO so it's at least a close cousin to a Buick. It's only got 12" of vacuum at idle, which isn't out of the ordinary for a RAIV but seems like it could be a little higher. The only thing I know is that everything was rebuild when the car was restored but it's been years ago has never really been driven except around the block a few times.