2006 GMC Yukon XL Denali

150k miles, AWD. Current owner has had the vehicle for 8 years.
Mechanic has indicated that it may need a Throttle Position Sensor (TPS).
Check Engine light has been on since they owned it, and the code indicates code P449 (EVAP system), and Tire Inflation Sensor issues.
Tires are fine.
Has Third Row Seat and DVD Player for rear passengers.