HP only determines your top speed.
Also, the 1ZZ-FE has a wider powerband than the 2ZZ-GE. 2ZZ's are abysmal when it comes to torque and only have power between 6800 and 7600rpm. Even a 'torqueless wonder' 86-88 non-turbo RX-7 will move quicker than your Celica
Go get the code(s) read at autozone. If I were to guess, $100 says your o2 sensor needs replaced.
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