Car running poorly when cold

Do you have a stock or aftermarket intake? Some of the aftermarket intakes have no heat crossover under the carb and that will make the car run bad in cold weather. If you have a stock intake and exhaust manifolds either the heat crossover is plugged and/or the heat riser in the exhaust manifold is stuck. These are just a couple of old problems that we used to deal with in the days of carburetors. Cool, moist climates need heat or the carb ices up.