Mine does the exact same thing, revs up and down, so just recharging wil make this go away..

Also when the ac is on and im driving the temp meter is near or on the white area, or just before the N, does this have anything to do with that???

Matt

'97 Pumice Zetec Sport- Superchip/Apexi DTM Tip/KKM/blue lights/removed door dings/De-Badged/ford racing 9mm-blue/Custom Interior/indiglo gauges
Audio
-3 JL Audio 10s/-2 kenwoods amps/-JVC cd head unit (with 12 disc changer)/-6x8 pioneers
http://www.geocities.com/mattbchillin