Hi guys, Recently rebuilt the carburettor on '80 release year buick 350 engine. Has 4 barrel quad- Unsure of specific model. It has a hot air riser for the choke. Pulling the throttle pedal, the choke plate doesn't close when cold. When warm, it does however engage in a small level depeding on whether it is a 'truely' hot engine, or just been running for a few minutes. Either way- it works sometimes on a somewhat warm engine by simply having a bit of throttle open and then the choke operates through the vaccum, or can sometimes kick in by driving away... IE.. the choke is not operating whilst cold. I feather the throttle until the engine is comfortable on it's own- then I start pulling away, and the choke suddenly operates and the car behaves as normal then on including normal kick down idle speed. At the minute I have to use my finger on the choke mechanism and I can drive away. Both the choke plate is closed, and the high idle is there. When engine is warn, the vehicle kicks down to hot idle perfectly fine and runs as it should. Although the carburettor was taken apart, I didn't bend the linkages, or change any screw settings or adjust the choke spring unit (riveted anyway). I have tried applying some lube on the linkage arms, but that hasn't done anything. I'm sure I sound like a right noob. But i've never had a car with an automatic choke, much less american iron.... All my bikes and cars currently and before have had manual chokes- Whether they are a choke with high idle, or simply in the case of my Commie German bike a 'Fuel enrichment' system which doesn't have any choke butterfly or high idle. Anyway- little stumped. Any help would be greatly appreciated!