1986 Pontiac Firebird

Okay I have an 1986 Firebird, total piece. It ran great when I got it, but now... everything is screwed. It idles really bad, and no one can figure out why. I have a severe wiring problem, when my lights are on I have no left turn signal and the right one blinks really slow.  when they are off and I put my turn signal on, my gas gauge goes down a 1/4 of a tank. I have no dash lights or dome light. It's been in a FEW accidents (none were mine) and you have to throw yourself at the passenger door to get it open and closed. OH! and my wheels and tires are too big so the scrape when I turn sharp (really loud) I know no one is perfect, but damn! you gotta draw the line somewhere.
Sarah Lashley