My cat was replaced and my car is still chugging why? on 2003 Nissan Sentra

plugs replaced coils......please help

by in Marianna, FL on January 19, 2014
2 answers 1 comment
ANSWER by , January 19, 2014
Check engine light on?
COMMENT by , January 20, 2014
code was cat needed to be replaced....but got in car drove away from repair shop and still didn't sound right. More I drove back to the chugging sound like it was missing a cylinder as before......and yes light came back on not right away but within 2 days.....please help
ANSWER by , January 20, 2014
BECAUSE THAT WAS NOT THE PROBLEM.HAVE CODES SCANNED AND POST