Is this happening when you are not on the throttle, coasting to a stop? The PCM will cut fuel and timing when comming to a stop, that is normal. Once you are at a stop, fuel and timing will revert to your idle tables and then AFR should return to 14.7:1. Look at what your TPS is reading when this happens. Better yet, post the log and I will have a look and see if what you have going on is normal
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A SS looks like it could kick your ass if it wanted to, but a WS6 looks like it's coming over to do it
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