Frustrating.....won't run right....I offered some things to try to make the car run better. It's acting like a vacuum leak is causing the computer to open/close the throttle, which affects the vacuum leak, which affects the throttle...and so on....
Did you put on a new gasket with the intake?
Spraying WD40 all over the carb/intake/manifold/gaskets, etc.
will usually make things get better temporarily if there is a vacuum leak.....