Loads Up at Idle and After Shutting Off

[67L30WGN]

Stock '72 350 and quadrajet. Sometimes, not always, the engine loads up at idle/off-idle causing it to run rough and sometimes, not always, it loads up after I shut the engine off and go to restart it (even if it was running smoothly when shut off), resulting in a big cloud of smoke. She runs smooth as can be on the highway.

I'm thinking either there is dirt in the bowl causing the needle not to seat everytime, or the float is starting to float a little lower.

What are your thoughts? Time to overhaul the carb?

[DavesRide]

A common problem with the quadrajet is the well plugs leaking. http://www.florida4x4.com/tech/quadr...g/wellplug.htm
Check out the link. I just rebuilt mine and another trick is a piece of special foam that absorbs the fuel that leaks. A bad float might also cause this if it has sunk and allowing fuel to overflow into intake. Just some ideas for you to check out. David

[67L30WGN]

I'll have to check the plugs when I pull it apart. Thanks. After you told me about this, I did a little search and found some good pictures wishowing the fix on this link:

http://www.stratagaz.com/Quadrajet/Q...et_7029202.htm