How do i fix the reduced power engine on my 03 yukon???

What is your question?

I turn on my truck in the beginning it drives good i floor it and driving normal all of a sudden the reduced engine power comes on and doesnt have power to the engine and it starts shaking like a spark plug needs to be replaced how do i fix that i had the throttle body connector replaced and i cant seem to find the problem...

How long has your 2003 GMC Yukon had this problem?

1 month