If it is a rear wheel drive vehicle it is either low oil in the rear end or an axle bearing. On a front wheel drive vehicle it is probably a bearing.
because it is going uphill and the engine has to work harder?
Gravity causes falling objects to accelerate.
Accelerate, motion is generated by applying force to mass.
It is the alternator....
have you checked to make shure that hte cruise control isn't on if your vehicle has one?
The side forces on the tires causes the vehicle to accelerate toward the center of the turn. If this doesn't answer your question, could you be a little more specific?
Could be: Power steering pump Alternator bearing Water pump Belt tensioner or in drive train
THRUST
the brakes
Have you had your spark plugs or wires changed? The hesitiation when you step on the gas could be related to a firing issue. If you accelerate on the gas to go right away does it seem rough?
Well the vehicle is backfiring which can be caused by bad gas, spark plugs, or just needs some carburetor service.
electrical interference