I just bought a bad lifted1980 F250! (Carbureted) With a 351 that’s worked! It was running great until I had a small electrical problem. Before I got around to fixing it the weather got really cold about 17*. Some coolant leaked out of the bottom end. It was slush that leaked out, and slush in the hoses. It warmed up a couple days later, and I got it to turn over again. Now it starts, but only when I have the throttle all the way to the floor. Once I take my foot of it shuts down, and sometimes back fires. It also shoots flames out of the carb, and just dosnt sound right. IM FREAKING OUT!
Is this just a carb- fuel problem or did it crack the block.
I spent all my savings on this new toy please Help me! If you don’t think its a cracked block what do u think it is. (Choke, fuel pump?) Etc.

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