It's probably a rev. limiter. As stated above it keeps you from over reving the engine. From what I read (FROM YOUR POST AND IF I UNDERSTOOD IT CORRECTLY) if you mash the pedal to the floor in park or with your foot on the brake and at idle the engine doesn't want to pull the full rpm's. Well, if that's the case, it's not supposed to. My 2002 Ford Ranger does the same thing, though it starts surging around 3500rpm's if I mash the pedal at idle. (So ya don't over rev. the engine). If your running fine under NORMAL operating conditions then don't worry about it. If it isn't surging at idle (without the pedal to the floor). Don't worry about it.
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P4 3.2 'E', 4GB DDR400, XFX Geforce 6600GT 256MB AGP, MSI 865PE Neo2-P, WD S-ATA II 500GB HDD, Win. Vista
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