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Input is appreciated...

When i am engaged in gear and slowing down with the rpm up past 3500, If i tap the gas pedal (or sometimes dont have to but it wont be as loud) when the rpms decline to anywhere from 3500 to 3000 rpm either one loud pop or a tight cluster of pops occur. My question is... is this a backfire sometimes or is it just backpressure or fuel burning off in the exhaust. I do have a fuel pressure regulator with psi set at 38 for now. Also have msd coil and cap which i thought would burn the gas off better to eliminate this, intake, header, exhaust, no cat. Any clue if this is bad for the engine or if i dont need to worry about it.
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