Hello, new member, first post. Lokor help. I have a 2012 yukon denali 6.2. It's new to me so I don't know much about its past. The problem I have is with reduced engine power, some times when I start to pull out from a stop it will go into reduced engine power but it never has check engine light or had a code thrown. The check engine light works but doesn't come on when this happens. Anyone point me in the right direction to diagnose this. I have replaced the tps on the throttle body, just throwing money at it because that is what my Silverado needed few years ago.