not getting power and a loose belt sound from the engine
 

I just got a 2003 H2 last week. It ram fine til yesterday there is what kinda sounds like a loose belt sound and it kinda looses power it seems. I have to put the gas pedal to the floor to go uphill and this is on pavement. Is that normal for a Hummer? It's my 1st 4 wheel drive. What could be causing this? I am about to take it back :(

Think you need to take back or have a mechanic look at it. How many miles?

126,000 miles I havta take it in Monday