Sounds like the carb was icing up caused by the cold and also the intake of fuel, this is further confirmed by the condensation on your intake manifold. Later in the hotter weather the car will go to the other extreme where you may have vaporlock where the fuel lines and carbs get to hot and again cause fueling problems due to the fuel turning to vapour in the fuel lines/carb.
So for now get some more heat into the carb area, ie reduce the cold airflow to the intake area ?
A weaker mixture due to the icing will cause bad fueling and resulting backfires noise in exhaust also.
Last edited by BuyBritish; 01/10/22 06:43 AM.
