I have recently noticed that my 98 is back firing except it does not do it when I accelerate. It only does it when I slow down. Does anyone know what it may be? I am replacing the wires tomorrow. My dad said that it may be the timing. If it helps at all, I did the mod where the exhaust spark is re-routed. if anyone has any ideas just throw them down.

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1998 Ranger XLT 2.5L. 5-speed. Flowmaster exhaust. 40-channel CB w/ PA system. PIAA fog lights. Hella off-road lights

mine back fires after i removed the muffler so im thinking has something to do with that