[JRMichler]

Most of the time, your engine is running a stoichiometric fuel mixture. At stoichiometric, you get gas mileage, reasonable power, and good emissions.

Some cars will go into lean burn under certain conditions. Those conditions include low throttle (high vacuum). Gas mileage improves, power drops, and emissions get worse.

Most cars dump in extra fuel at wide open throttle (zero vacuum). Gas mileage gets really bad, power increases, and emissions get worse. Since the wide open throttle fuel enrichment is a step change, you feel it as a sudden increase in power.

You could readjust the WOT switch to keep it in fuel enrichment mode to eliminate the power jump when you hit WOT. In that case, expect the following:

Bad gas mileage.
Need to change oil more often due to unburned fuel contamination.
May kill the catalytic converter.
Carboned up spark plugs.

Or just stomp the gas pedal when you want full power. Then you won't notice the WOT fuel enrichment power jump.