what causes miss fires in Altima 2003,also would a defective cat converter cause on 2003 Nissan Altima

coil 1 and 2 have been replaced, codes 042 and 300 keep coming up

by in Bolingbrook, IL on May 23, 2013
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1 answer
ANSWER by , May 24, 2013
seek diag and est as it could be several issues,a plugged catt would cause misfires and lack of pwr