Q: code P0431 (cat-converter) comes up, replaced 3 sensors, Ignition coiles. will changing the spark plugs stop the rough idel and sl
code P0431 (cat-converter) comes up, replaced 3 sensors, Ignition coils. will changing the spark plugs stop the rough idle and slight shaking going about 30-45 mph? can't pass insp. in NJ.
My car has an automatic transmission.
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