...fired a machine gun? It's a 1990 Honda Civic DX, fuel injected. It doesn't seem to matter if it's -10C or -30 degrees C, sometimes it backfires, sometimes not, whatever it wants. Also it's only for 3 or 4 minutes, then it shuts up usually till the next morn when I start it again. Answer as if I am an infant or small child, cause I do not know s*** about engines and cars and so forth.