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Not just idle. It will richen the entire range.
If you have an O2 sensor, the duty cycle should tell you whether you are within factory spec. Also, the spark plugs will give you information. I say don't be afraid. Too lean is the worst outcome, but even then your car will surge and pop if it's way too lean.
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Man of Carbon Fiber (stronger than steel)
Mocha 1978 911SC. "Coco"
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