When I start my car up (01 SS), the light are pulsing. Almost like how old cars headlights would do while it idles. Tapping the gas does not help it, it does not even change the wave length. All my light do it. At night you can see it really good. The interior lights, the headlight, tail lights, and even the dash board light. It goes away after a few min. I can't say how long it's been doing it, because I don't drive my car that often (OOH YEAH Driveway Queen

).
Is this normal, or do I need to have my car looked at? When I first noticed it, I thought the alt was going bad, but the gauge showed it as still being good.
Thanks in advance