Dead pedal when shifting into 2nd gear?

[mcrn]

Hi everyone and thanks in advance. I am new here. I just got an 03 Yukon and I just dropped the vehicle off at the dealership for some warranty issues I have noticed. One of the issues that they have not gotten to duplicate is that sometimes (its very rare) when pulling away from a dead stop the vehicle will shift into 2nd and then the gas pedal is just dead. I can floor it and nothing happens. This will go on for about 3 to 4 seconds and then all of the sudden I have full power! The vehicle is drive by wire so my guess and hope is its just a sensor but that is just my guess. It is not a consistent thing by any means. But it still happens at times and of coarse the dealer needs to experience it happening. Any advice is appreciated. Thank you in advance! The vehicle is the 5.3 with flex fuel and all wheel drive. About 54K on it.

 

[boostaholic]

TPS sensor could be out of calibration. Part is cheap from the stealer or napa.

 

[mcrn]

I thought about the TPS but if thats what it was woudn't I be having this symptom in other gears or times other than just when going into 2nd gear?