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Is it in 4 cyl mode when this happens? I've driven a few automatics that hesitate a bit when slow coasting in 4 cyl then easing back into the throttle.
Especially if low octane fuel has ever been used in the car. The L99 has a problem of the ECM getting stuck on the low octane table. Look up the L99 fuse pull info, do that, then make sure to use premium fuel. Also check on the dash if it's in 4 cyl or 8 cyl mode when this is happening.
I'm also leaning towards it's AFM and possibly the fuse pull thing related.
The car has self diagnostics for misfires. If it ever actually misfires it will set a code and turn on the check engine light.
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