no power to climb hill after driving for a while

A 2007 vehicle has problem when the engine gets hot and loose power to climb hill. any one had similar problem and how was it resove are what the problem was?

That is exactly my problem can some one helpeverthing has been change

Have you had a problem that caused spark plugs and wires to be changed? The reason I ask is that a badly misfiring spark plug will cause a rich fuel mixture through the catalytic converter(s) that, given enough time, will cause damage to the catalyst. When the engine is up to temperature and has been for a while, the converter may start to plug up partially and restrict exhaust flow.

It's a shot in the dark, but is it a possibility?

When you put the pedal to the metal, doe's the transmission down shift?

If it's a bad, or plugged catalytic converter, it maybe still covered under federal emissions warranty.
8year/80kmiles