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first off.... does the engine over rev on its own? or only after you press the gas pedal?
does your vehicle have a throttle body that is electronic or cable actuated?..if electronic and revs on own could be one of two issues 1) throttle body itself 2)throttle pedal switch on gas pedal)
if cable and revs after pushing gas pedal ..either there is too much carbon built up on the throttle plate or the throttle cable has begun to fail.. remove the intake tube from the air cleaner to the throttle body and inspect
full power is only achieved when the engine is fully warm(operating temp).so if you accelerate more than, say, a third of the gas pedal,the car will feel sluggish.
this is more apparent when first starting the car in the morning in winter.almost like the car is going to stall.
most wear in the engine is leaving it to idle when cold you should always drive the car straight away from cold.then when hot turn on the a/c if required....
For an engine to work properly, the fuel air mix must be within certain parameters. Too much fuel uses up the available air before the all the fuel is burned and causes the engine to 'stumble' (a momentary lack of power until the fuel/air ratio has been restored). Flooring the pedal can certainly cause these symptoms.
When this happens, it's lack of air, not gas that causes it. Check your air filter as a possible cause, it may need to be replaced.
The computer will not allow the car to full rev in park to protect the engine. Likewise there is a rev limiter when in drive which will shut down injectors at high engine speeds usually around 5000 RPM or so.