I've noticed over the last month my RPMs will drop occasionally when I'm idling and then the dash and center console lights go a little dim too for a second. The car won't die or anything but it worries me. Oh and also when I roll my windows down the lights dim slightly too. Am I experiencing the beginning of an electrical problem or battery failure?

 

Is this while you turn on the cold air/hot air or A/C in the car? When you turn the radio on? Because any of these can have a say in it, especially if you're running amps in your Evo because they pull power, all of this has to do with the alternator & engine.

 

check the gound connection , and make it better'