Trucks stalls and normal speeds, I can feel it begin to lose power. I coast to a stop. Sometime it starts right up. Somestimes it takes a few minutes. It is becoming more frequent ,, doing it every other day now.. changed fuel filter , didn't seem to help. Doesn't idle rough, doesn't backfire, just quietly loses power. Last time it would not start ntil the next day, maybe I flooded it, in an attempt to start it.