400 sbc, quadrajet carb it runs the worst when it's below like 50* degrees outside. from a cold start it smokes and sputters for a good half hour before it finally gets warm. most of the time it's fine after it gets warm. it'll idle pretty smooth, just a little high and have a small amount of smoke still (no much whitish/bluish smoke). sometimes though it will be at operating temp going down the road and it sounds like im losing a cylinder or more. im not afraid to tear into this or throw parts at it, but i really have no clue when it comes to these carbs. help!