I have a 2000 Chevy Blazer 4.6 L Now it cranks and only back fires why is this?

Question:
At first when cold it would start up without any problems, but when it warmed up it was hard to start and you could smell excess fuel. Now, all it does is crank and back fires even when cold. I have changed the fuel filter twice, fuel pump, spark plugs, cap and rotor. I have also ran a fuel system cleaner through the system twice.

Answers:

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