The van is really hard to start the first time each day, it is a 1977 chev g20 with the 350 engine, after it has been started once each day it has no problem...but the first time is a real pain!
Cold Start trouble on 1990 Chevrolet G Series Van (G20)
the old q jet carbs had a problem with bleed down overnight. the plugs in the bottom of the bowl leaked fuel. the carb needs to be re built and all the plugs sealed.