It's pretty difficult to get a computerized fuel injected car to backfire. I'd guess you have a severe air-fuel ratio problem, or maybe a cylinder with no spark. Any of which should light the CEL up quick.
96 GL Zetec ATX, white with pinstripe, nickname " Sam Smooth " mods so far: CTA intake with homemade heat shield, KVR drilled front rotors & carbon pads w/ 500° fluid planned mods: exhaust (want to keep it quiet), e-ram (awaiting installation), diablo chip involuntary mods: compression increased after head gasket failure
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