My motor only has 8000 on it and since the cold weather it tends to die sometimes not all the time. Well anyway its gradually been running worse and now it won't even idle hardly. If you give it any gas it backfires through the carb. The thing is motor, carb and everything including ignition was all new at the same time. i took the carb off tok it apart cleaned it (nothing looked wrong) new plugs, cap, rotor and it still does the same thing!!!!!!!! The carb is edelbrock #1406 (350 motor non-emissions) I sprayed carb fluid around the intake and carb to see if there were any vacuum leaks but didn't find any. I think the problem is the carb. What do you think? DOES ANYBODY WANT TO BUY A CARB!!!!!!!!!