Thanks Steve! The terms and abbv. post really helped a lot. After finding out what those parts are I realized that almost the whole vacuum system is routed wrong and I've got some parts to buy.
It's got about 80K with a C6. Trim is unknown. I'm guessing it's base but it does have A/C. Maintenance history is unknown. Only mods I know of beside the vacuum tube gutting are the air pump belt was gone (hooked back up) and and the cat was deleted.
The other half of the vacuum diagram:
Here's what I've done:
Pulled the carb off and found it was about to fall apart, tightened it all back up and put it back on, no change.
Checked compression, all normal.
Basic tune up: Replaced plugs (all looked normal), coil, distrib cap, no change. I reused the plug wires. They weren't leaking and seemed to be in good shape.
Pulled all the connection plugs in the engine bay, checked condition, filled them up with di-eletric grease, no change.
There are quite a few plugs just dangling. There's nothing around them to connect to, who knows where they went.
Thanks again for the help, greatly appreciated.