I have a 1980. Stock small block minus the catalytic converter system and some headers and true duals installed
She starts great cold and after it switches to low idle is fine....until I have driven it for 3-4 miles. It then runs rough at idle.
Today was a warmer day (70's) & after driving it for an hour I stopped at a store. When I came back to the car after 10 minutes it cranked over solid but didn't start for about 6 seconds...then stalled immediately. I then tried to start her again and had to give it several pumps of the gas pedal to get it started....about 10 seconds to start it.
It ran pretty rough at stop lights.
At first I thought the low idle just needed adjusting and maybe new spark plugs and wires as the heat may be affecting them.
Now I am wondering if it could be something else.
Anyone have a similar experience.....suggestions and opinions are appreciated.
I would agree with @73shark and look at your carb. Sounds like a Q-jet in which case I would go ahead and rebuild it and when reinstalling I would look at all vacuum lines and make sure I had no leaks. I installed an Autometer Vacuum gauge under the hood that comes off the intake manifold so I can always see how many inches of vacuum I am pulling and makes adjusting timing and carb settings much easier.
Daytona Yellow '75 350 Muncie 4 spd
Corvette is a registered trademark of the General Motors Corporation(GM) &
Chevrolet Motor Division. Vette Registries, LLC is responsible for all site content (except for member submitted content or where otherwise
noted) and does not claim or imply that Chevrolet or
GM is responsible for Official C3 Vette Registry content. Vette Registries, LLC is independent from GM and is not affiliated
with, sponsored or supported by GM. Copyright/trademark/sales mark
infringements are not intended, or implied and are in fact used to support
GM, Chevrolet and Corvette.
Official C3 Vette Registry content is Copyright 2001-2017, Vette Registries, LLC. Content may not be reused without written consent. All Rights Reserved. NS
Corvette (Vette) Model Years on this site: 1968 1969 1970 1971 1972 1973 1974 1975 1976 1977 1978 1979 1980 1981 1982