Re: misfire p3000 after catalytic converter replace
You only replaced one side? Are the o2 sensors working properly? Sure the muffler is not restricted? If the cat was welded in did they get a good seal at the weld points? Too many variables to diagnose without more info. Try to get a scan tool on it that can monitor misfire counts and find out which cylinders are misfiring. Check your o2 data make sure you dont have a dead or lazy pre cat sensor. Doubt you have a vacuum leak as that would increase idle speed and set a lean code.
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1987 Jeep YJ 403hp sbc 653hp on NOS
1998 Chev Z71
2007 Chev Trailblazer SS
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