I have a 01 sierra c3 which is awd. I had a custom tune done to it. On my dyno data sheet its showing surging spikes on my curve for torque and hp. I used a rwd dyno so I had to take my front driveshaft out. I know my transfer case has a 62/38 split. Was this surging caused by taking out the front driveshaft and making the computer freak out?