07 Corvette M6, Long tubes, no cats, X pipe with Ecs Supercharger. I have a surge on light throttle and coast. With the help of the guys over on the Corvette forum I have switched to a SD tune, changed the base running airflow, Changed the closed loop proportional settings and have been working on the vve table. It did surge at idle but now its rock steady. In the attached log in the first couple of minutes when coasting down the spark timing drops to 3.5*. That is below the idle timing of 15*. is there something that is controlling that? Should it not do that? I have also included the tune. Thanks