Auto parts stores should have a loaner vacuum gauge. Have you checked the Throttle Position Switch on the drivers side of the throttle body, small black plastic box you can pop the cover off and make sure it moves from contact to contact. You could clean all the grounds and the coolant temp bullet connections. Here's a few links that will help. Also could be a clogged up air filter or housing, maybe both.
Cleaning the brass,http://atlanticz.ca/zclub/techtips/e...ons/index.html
TPS switch, http://atlanticz.ca/zclub/techtips/tps/index.html
Everything else on a '77, Tech Tips
You'll get it figured out on here.![]()
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