If you are having trouble accelerating few things to check
1) air filter is clean and piping to the throttle body is clean
2) injectors are clean. You can get them taken out and cleaned for reasonably cheap, helps with fuel economy slightly as well
3) Fuel pump is in fine working order, if not, it may be phsycially unable to send the fuel to the engine
4) Cat converter hasn't collapsed. Knock on it lightly with a hammer (when cold) if you hear rattling it's collapsed, this will severly hamper the engine from producing power which is what you need when accelerating.
Few things to check.
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