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I wouldn't say this if you had a fuel trim code, but sometimes the extra info is more like extra noise. About a year ago I had an unstable idle, saw my fuel trim sitting around -15%. Looked for something causing me to be running rich, but I found and repaired a vacuum leak. That fixed idle issues, drove / ran fine, but fuel trims moved up to -22%. I still don't know why my fuel trims are so far off.
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