[Coley]

I agree with guys here
1) Advance the timing.....and do this before you touch the carb.
2) Check for vacuum leaks...everywhere. You can put a piece of soft cloth in the jaws of a set of pliers and carefully pinch all of the hoses including the brake booster supply...if the idle improves when you do this on any hose...that item is leaking vacuum.
3) What type of carb?.....
With the quadrajets....most need to be thoroughly cleaned every couple of years to get and keep them working right.
so....is it a quadrajet?


Coley