I have a 86 iroc 355 w/ carb, edelbrock rpm performer intake, fuelie heads, comp cams extreme enegy cam. when i start the car for the first time of the day, it is running on only 6 or 7 cylinders. it will do this all day, the only way i can get it to clear up is to floor it for about 6-8 seconds. it will run perfect the rest of the day. im thinking the plugs get something on them causing them not to fire until i floor it. if i change them, the car doesnt miss when i start it until a few days later. i first thought the carb, but i swapped carbs, still does it. have good fuel pressure. any suggestion are greatly appreciated.