Changed motor mounts, now car stalls when revs drop?
 

Car:
2002 Miata 1.8 BEGI s4 turbo kit. Xede piggy back.

Story:
Car drove fine, started fine, returned to idle perfectly. I changed my motor mounts as one of them was ripped in half.

I had to lift the engine quite high to remove the mounts and during this time I suspect something went wrong.

Now when i start the car it starts and idles fine but will not return to idle properly after revs. It will stall if I rev high enough to create any positive pressure in the system. When I come to a light, if i don't baby it down from rev's, she will stall. I did find that if the AC is active the extra timing or dashpot will cause a normal recovery.

My vacuum is at neg 16-17 PSI at idle and i was boosting in the 11.5 and it's down to a consistent 9-10.

I've been looking for vac leaks? Not sure where else to head with this one?

Anything? Just last night I started it and the idle sagged down to like 500 with -8 on the gauge in the 10afr's.

Anyone know of a sensor that would cause similar problems? It's so subtle that it's hard to track down :(