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97 Cadillac Deville (Service Engine


userpete1037
12-01-2011, 08:01 PM
My car is idling rough and the Service Engine light blinks on/off continuously. I ran the codes and they are P0301, P0401 and P1258. Does anybody know what this could be? I changed the plugs, wires and ignition coils about a year ago. Catalytic converter was replaced around the same time but the O2 sensors hasn't been changed. Could that be the cause?
maxwedge
12-02-2011, 09:04 AM
301 is a percieved engine miss in #1 cyl. Google the other two for in depth info, plenty of info out there.

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