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Ok my suburban was running fine then my wife headed to work and called me it was running really rough. And throwing o2 sensor code I changed it still running rough. So I changed the plugs no luck . Them cut cats off and replaced with pipe and flow master . No luck changed the distributor cap and butron. Them changed fuel pump Spyder injector. Fuel filter cam sensor . New plugs again. Maf sensor no luck just changed crank sensor everything I change makes it run a little better but not normal. Still getting random misfire any help out there