89 mustang mspnp2 surges in park

Turn off EGO correction at idle until you get this sorted, I personally leave my threshold at 1200rpm. Also shoot for a slightly rich idle, at least initially to make it less finiky. Shoot for 13.5-14.

The idle valve closed/open duty are set at 0/100, these values need to be set correctly.

You have drastic swings in the VE table in/near the idle cells, these transitions need to be cleaned up. The VE table in general needs alot of work.

You also have EGO correction to start at 0 degrees, I'd move that up to the point where WUE is off.