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Bought car not running......they replaced etm with used one. I replaced etm with pre loaded one. Replaced plugs, maf, coolant hoses, thermostat. Car runs rough sine I got it running. Code showed bad O2 replaced with bosh oem. Cat gets glowing red but only at front and O2 code came back after sensor replaced. Coils seem fine but sounds like backfire near intake.......replaced intake gasket. Exhaust seems to blow hard. What would you do next. Thanks
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