lack of power

'00 Focus 1,6l Zetec lacks power under load. Idle and any constant rpm is just fine. Reving or any load and engine hesitates and will not pull. 1.gear
feels like 3rd. I guess this problem is related to fuel delivery. Any thoughts?
Colin
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Fuel pump or filter are possible problems. When's the last time you had a full tune-up - new plugs and wires, clean the intake system etc? Have you had it checked for codes (could be a sensor). How's your air filter? Often it's more than one thing. There's so many possible causes and the only way to know is a hands-on inspection by a trained technician.
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