I’m curious to find out what causes a loss of power during curves or turns on uphill grades. This has been happening since a week ago. The car actually died on one occasion. Could it be water in the gas or is it not something that simple?
I think this kinda thing usually calls for a “tune-up”, but someone else here will be able to give you a better idea.
Another possibility, based on symptoms, is a problem with the fuel pickup in the gas tank. I had these exact symptoms with my '74 Volvo (one of countless problems with that car), and it turned out to be a problem with the fuel pickup.
Even though I can’t recall exactly what the problem was with that part, when the tank was dropped and the fuel pickup was replaced, it did take care of the situation.