Have a look at your air intake hose- the big black rubber bellows from AMM to the throttle/intake.
If this problem goes away when you shut the car off and restart, it's a real possibility that what happens is this: the high flow or vacuum condition of the full-throttle driving causes the intake hose to collapse, and it folds up on itself. From that point on, it holds itself tightly until the vacuum goes away- i.e. when you shut off the engine. Then, it springs back into shape, enough to drive pretty normally till it happens again.

It seems that the original hoses are just kind of soft, or a little too long, and they kind of get a kink in them, a corner instead of a curve. Replace it if it looks like it has been kinked. FCP Groton sells them for a lot less than the dealer.

Good luck!
--
Rob Bareiss, New London CT ::: Roterande Fläkt Och Drivremmar!

Check your Coolant Temperature sensor (not the sensor for the temp-gauge). See this FAQ section.

ALso check for large vacuum leaks in your intake system.

Noel