I have a fx921 big block that backfires like a stick of dynamite when you try to start it. I'm wondering if the valves may be off and not igniting the fuel. If I crank it over hot or cold nothing happens and if I choke it until it lets out this huge backfire then shut the choke off it starts up and runs perfectly. I have tried to start it and shut it off and then restart immediatly and it does the same thing. Fuel selinoide is working fine so no proplem there
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