same thing happen to me i was going 45 mph and there where 2 18 wheeler in front of me so i down shit in 2 with traction control on and the engine just stop and i literally almost hit my head on the steering wheel then a second lather the ls3 just kick in yo
but after that i fond out if you remove the traction control it wont happen it will go without a delay but when ever you will down shift it with tc on and it will hit a high rpm the engine will stop for a second