The truck has sat for some time. I replaced the gas tank, replaced the gas pump and cleaned the lines. I've never adjusted the valves. I have rebuilt the carb, but like I was saying to bartamos, I'm going to take it of and try to make sure everything is good. Thanks too much for the reply.
Thank you for responding to my basic questions.
The symptoms you described in your original post do not indicate carburetor problems. They indicate valve train issues, specifically sticking/slow-to-rebound valves.
Since you took the leap to open up the carburetor, you may, or may not have created an additional malfunction. This makes troubleshooting very difficult.
This is why many of us preach to test every component which makes an engine run right EXCEPT the carburetor. Save the carburetor for last. It seems never to be the carburetor.
What I would do now is forget about the carburetor for now since the engine will idle "all day long".
Pull the valve cover.
Look for bent push rods.
If the there are no bent push rods, start the engine and run at idle and look for oil showing up in the weep holes in the top of the rocker arms.
Get back to me after you do this.
There is more to check, but I don't want to flood you with to much information all at once.
