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check fuel pressure with a gauge as well as fuel volume. pressure should be around 35 lbs and the volume should be about 1 litre in 30 seconds. if its not then this can cause poor power going up hills and accelerating. how long has it been since the fuel filter was changed.
I would start by checking the transmission fluid, and even would recommend replacing it. Hopefully a new fluid and filter change will do justice to the problem. If you notice a burnt smell or dark brown colored oil on the transmission dipstick then its obviously time for a change. Lets hope that its enough to fix the problem, if not, a new transmission/rebuild may be in the near future for you.
Try changing the fuel filter. If it clogs up the engine won't get the fuel it needs to run at wide throttle openings, the engine will ****** the timing, and you'll lose power. With less throttle the filter can flow well enough for the engine to run properly.
if your vehicle slows from 70 downto 60 with no change in revs ,then the transmission is slipping .. imust say i dont believe that the speed drops back without the revs dropping down too, i am not calling you a liar ,i`m saying you are not making accurate observations , and without those we are just guessing .