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Ok, this has been bothering me for a year now. I need some ideas on what this could be?

I have noticed that when driving in the daytime the little D light on the gauge Cluster is bright which is normal. When I put my foot on the pedal it dims for a couple seconds. I also noticed my idleing is around 500 rpms which I fell is really low but I don't feel the car shaking when it hits that.

If I turn the fans on just a couple notches everything is fixed. The D light is bright no matter what and the idleing is around 600 rpms give or take. I cant figure out why the fans would fix this. The fans must be asking for more power which helps idleing but why is it when I put my foot on the pedal it dims for a second. I would think it would be the oppisite due to more rpms. Guys help me out here!