[rennalds]

My sons truck had a similar problem. It all started after we went to a chrome air filter. I think the problem with this is that if your are still using the Q-Jet carb it needs the warm air from the exhaust manifold to close the choke once the engine gets hot. This is just a theory of mine. But when we changed out the carb the problem was solved. I think keeping your foot on the accelerator allows just enough air into the carb to keep it going.