help on tune up and carburetor issues

[centuryhouse]

Also - couldn't vacuum issues be effecting this? If the carb is leaking around the base wouldn't that cause issues?

Also, and vacuum related, a guy at work has a 67 Chevy pickup. A thicker hose goes from the brake booster to the manifold on his. On mine, there is some plastic part (almost looks like a fuel filter looks) that plugs into the booster and then runs a smaller hose to the manifold. Can someone tell me what that plastic piece might be?

[Motosharpley]

so one thing I didn't see yet is to check that your getting squirt from your accelerator pump. this would cause stumble on acceleration. Looking at the pics there is a good chance your squirters are clogged or the accelerator pump diaphram could be blown. To check pull your air cleaner and with the engine off work the throttle you should be able to see and hear two streams of fuel squirting from the nozzle. If no squirt the nozzle can be removed and cleaned with carb cleaner it is just a single screw but be VERY careful not to drop it down the carb. Or better yet pull the carb and do it off the vehicle.

[Motosharpley]

And if you don't have one already when you get a timing light get a vacuum gauge it makes tuning a whole lot easier

[centuryhouse]

Originally Posted by Motosharpley

...check that your getting squirt from your accelerator pump. this would cause stumble on acceleration.

I checked with the engine off, and steady, even jets come from both sides.