I have a '58 Apache 1/2 ton with a bone stock 283. After the engine warms up thoroughly the truck will not run smoothly at a constant cruising speed. Decelerating, and accelerating will smooth it out, but once it tries to run at a constant speed the truck bucks violently. It will not idle smoothly once it reaches running temp.
It has new points, plugs, condensor, rotor, distributor cap.
I've had the original 2-barrel rebuilt. I've had a remanufactured 2-barrel carter, and a remanufactured Rochester on it and it acts the same way
with all three......
It 's also hard to start, after shutting it off for a few minutes while at running temp. When I look down the throat of the carb, I can see fuel boiling into the carb. I believe the exhaust crossover in the intake manifold is overactive. I thought the butterfly was stuck closed, so I pulled the exhaust flange, and the rod is still there, but the butterfly is altogether gone.
I'm thinking that when I put the intake manifold on I may have left off a baffle, or the intake gasket didn't have a baffle, or the baffle rusted away in the 15 years since I built the engine. It's been doing this for a few years.
Have any of you guys had this problem before?
Thanks in advance guys.
-kevin
