I have a 1974 Chevrolet Caprice Estate with an original 400 V-8 and Quadrajet four barrel carb. Just recently I have been having some carb issues that I have never had with this car. When I start it cold it starts real nice and runs at high idle like it should but it will not kick down to normal idle. I drive it for a bit and then the idle is normal. I have given the car a look over externally and everything looks as it should. There is no binding of any kind in the carb linkages. Once I have driven the car, the carb runs as it should even after turning it off and starting again. It only does this when in cold start. I rebuilt this carb back in 1995 and it has been perfect in every way until now. I usually put about 500 to 1000 miles on the car every year going to car events. Does anyone have an idea what could be happening. I would appreciate any thoughts on the matter. Thanks and cheers. George.
