Quote:
Originally Posted by lowrydr310
When was the last time you guys changed plugs and coils? I had all the multiple cylinder misfire codes and rough idle which was fixed by replacing the coils and plugs.
P0171 could be a vacuum leak. Check your crankcase breather hose and oil separator as these are prone to cracking/leaking.
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Last time I changed my spark plugs was 15k miles ago because it had rough idle and misfire, but I haven't changed my coils yet. Which I probably should.