Alfalasi

I have been looking closely to my rpm, once you start the car rpm keep fluctuating on idle which I think normal given the type of this vehicle, but it increased a bit lately and when waiting for car to warm up I noticed interior light next to my feet were a bit flickering (not to the point were it goes off completely) , just a little. it dims simultaneously with rpm fluctuation..
should I be concerned of car electric system ? coils, sparkplugs. or that's part of gt3 excitement