Quote Originally Posted by Coltomi View Post
at those moments the AFGS spikes to 450 g/s which is very unreasonable
It is. I don't think anything in your tune would cause that but I'm by no means qualified to give advice in that regard.

That extremely large airflow # is exactly what my MAF was reporting all the time after I damaged it trying to clean the sensor wires. I'm sure the stumble you felt was due to a massive amount of fuel being dumped causing a flood. Just speculation, but you might check the power lead going to the MAF for breaks - i.e. wiggle the harness while logging with key on / engine off and see if afgs jumps like that. Also try gently tapping the MAF housing.