I have a 1982 Z 28 with the Crossfire V8 305 TBI. I am having issues when the engine is hot and the vehicle has been sitting for 45 minutes to one hour. When the engine is cold there is no problem at all. When the car has been driven for 30 minutes or more and the engine is hot there is a problem when the vehicle sits for 45 minutes or more. If you get back in the car after say 5 or 10 minutes there is no problem, but when it sits for 45 minutes or more it will restart but I can barely keep it running. Any thoughts on this would be greatly appreciated.