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misfiring and back firing are 2 different things.  which do you have?

On a high output turbo motor, back fire when you from wide open throttle to closed throttle is common.  If you have any sort of free flow exhaust, it will be worse.  A back fire in this condition is bad for the car.  some guys even like it.

A misfire is totally different.  You would feel that in the truck, not just hear it.