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All engines idle when the throttle plate is closed. You should see a low spike in the AFR that recovers to idle level ~13.5 give or take for CIS. Coasting is engine breaking which will pull air back through the exhaust and may scew your AFR reading depending on where the O2 sensor is located.
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RarlyL8 Motorsports / M&K Exhaust - 911/930 Exhaust Systems, Turbos, TiAL, CIS Mods/Rebuilds
'78 911SC Widebody, 930 engine, 915 Tranny, K27, SC Cams, RL8 Headers & GT3 Muffler. 350whp @ 0.75bar
Brian B. (256)536-9977 Service@MKExhaust Brian@RarlyL8
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