car running rough
 

I have an lt8 with a big turbo 720 &1680 injectors big street port,the oil seal on the turbo went bad so I put the factory turbo for now but the car runs like its choking sometimes and other times it sounds like its predetonating, also now the car idels higher than before,I adjusted the maps to where the car is smooth exept for those 2 problems,could ir be to much back presure from the turbo,any help would be appreciated, THANKS.

come on somebody help I know kabooski is good with microtech