How come your car smoke and backfire thenengine die out?

sounds like a problem with the engine manegment, also smoke is probably burning oil.

First thing to do is to check your oil level and if you havent changed the oil filter and oil recently I'd do that.

Then you can get a cleaner to put into you carb to clean out all the carbon deposits, then you should either clean and regap your spark plugs or get new ones.

Then you should take your car to a garage if none of the above fixes the problem