How long should your 45 plus year old carburetor last? Your old original carburetor could be simply worn out. Every time you push the throttle, the throttle shaft wears against the carburetor body creating friction and wear. After years of this, the wear between the shaft and body allows air to slip through the gap entering the engine. This old carburetor has no way to adjust for this un-metered air, throwing the idle fuel mixture so far out of adjustment that you will never be able to get the car to idle properly once it has warmed up. The only answer? You need to buy a 100% new carburetor.
EMPI