Stretched VNL

stretched a 2011 VNL D11 with Ishift to 320" wheelbase. I am having an issue on turns from a dead stop or when going under 5 mph. About halfway through the turn, there is a dead spot in the throttle response for about 3 seconds. Works perfectly when going straight. its not shifting, and all throttle response is gone for those few seconds. I am thinking it might be something with rear wheel speed going that much slower than fronts around corners. Any insight or anyone know of a solution? thanks

 

thanks for the reply...I have no lights resulting. Checking diagnostic history I have this, which I am fairly certain was there before the stretch

MID 136 SID 69 FMI 2

 

here is a photo

 

not positive, the stretch was done at a shop. I will have to go look.