I too have the issue of the 1320 code. Orginally had the 301 as well, so i replaced the #1 cyl. and changed out all of the spark plugs. Still have 1320 codes and the car still idles rough. Any thoughts? Do need to change out all of the coils b/c of the 1320 code or is there something else in the ignition system that could be causing the problem?
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