nogoslo

I'm having a problem with severe buckling (jolting) of the car as soon as I accelerate past 2-3 lbs. of boost. There is also a backfiring and air sounds under the hood. The car has been sitting since I flooded it about a week ago. I was able to get it running last night. I just had the plugs (ngk 7s, 9s), wires (Magnecore) and fuel filter replaced a couple weeks ago. The turbos were rebuilt last January. The hoses were replaced with silicon ones a year ago. I checked the clamps and double checked that the plugs are in right. I didn't see any archive exactly like this problem. I'm about to replace the plugs, in case they were fouled. Any other suggestions? Thanks in advance.

-Dawn