After installing my supercharger I've been having some idle problems. When I first put it on, the idle would drop so low that the car would shake as if it were about to stall, but never actually did stall. I redid my timing and it seemed to fix the problem.

Went to Autozone today to pick up some tire shine, and after heading out I was sitting at a light and my idle dropped really low again. Car started shaking, but it never stalled. Revved a few times slightly trying to get it to kick back up, only thing I did was get the people next to me to think that I wanted to race. When I got home, I let the car run for a second and the idle dropped low again. I realized I had forgotten to turn my lights on, so for whatever reason, I flicked them on and suddenly my idle rose to ~900 and stayed there. Turned them off, idle dropped, turned them back on, idle rose back to where it was before?! I find this very strange, can anyone explain to me why the hell that happened?

I'll probably just redo my timing with my lights off next time to fix it, but I'm curious as to why the hell that happened?