Q: when i push the gas my car dosent want to go as fast and wont go up hills on 1999 Toyota Camry

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it just moves slower when going up a hill and when i get ready to take off!. It also started today not wanting to go up a hill!!! what do i need to do or what could it possibly be???
(2) Answers
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Does it have a tachometer? If so what is that doing when your trying to accellerate? Assuming it's automatic trans , what does it do if you shift manually?