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Any chance that you're fuel tank is about 1/2 full or less (maybe 1/3 full)?
I had this exact same symptoms -- fine on level ground with lots of power, but couldn't climb a hill. But, it was only when the fuel level dropped to a certain point! See what you're fuel gauge says right now!
What it turned out to be was the small hose inside the fuel tank. It connects the pre-pump (in-tank pump) to the metal fuel line. It's only about 2" long, but it cracks eventually. When the fuel level is over this hose, no problem. But when the fuel level drops below this hose, if it's cracked, fuel doesn't flow well into the main pump, and it feels like you've lost power!
It's the hill -- when you were going uphill, the fuel in the tank shifted and uncovers the hose!
To confirm, fill up your fuel tank (it's strictly an internal leak -- this won't cause a loss of fuel as the fuel is just staying within the tank). If the symptoms disappear, you've got your proof. Have the fuel level sender pulled, change the little rubber hose (and change the pre-pump and it's "sock" strainer too, as preventive maintenance). All will be good again.
Good luck.
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