Why Wont My Truck Do a Burnout? (Problem Solved! Link in Description)

I have a new Sierra with a 5.3L motor, 6 speed tranny, 3.42 gears, Goodyear Eagle LS-2 275/55/R20s, custom tune, true dual exhaust and a K&N CAI. Ive put it in 2wd, disabled the trion control and StabiliTrak by pressing the button on the dash, manually put it in 1st, pulled the ABS fuse and put it in tow assist mode but it refused to spin the tires even a little. Itd only rev up to around 2000 rpm while pressing the brake and gas. The throttle response is shit and the truck is just plain gutless until it hits 4k RPMs.\r
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Performance upgrades:\r
TruckExhaustKits.com\r
2.25 Aluminized Steel Dual Exhaust Kit\r
Ebay.com\r
Flowmaster Super 40 Series Muffler \r
Dual Inlets 2.50, Dual Outlets 2.50 \r
AutoAnything.com,\r
K&N 77 Series Metal Intake Kit \r
Diablewtune.com\r
DiabloSport Trinity T1000 tuner\r
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Installing the custom tune:\r
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PROBLEM SOLVED!!\r
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Check out these other videos Ive taken of the truck:\r
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K&N Cold Air Intake Installation: \r
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Sound of before and after intake install: \r
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120 MPH Run:\r
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Exhaust Sound Flybys and Hard Acceleration:\r
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SVM Mobility Door Opening Demo:\r