Engine and electrical trouble

[Birddowg240]

I've been having some troubles with the car recently. For starters, my idles are out of wack. I'm pretty sure it's the idle control valve. I already did a tune up and that didn't help. Although i do have oil in where the spark plugs are. Need to get ne o rings for that. Second some weird electrical issues are happening. My windows won't go up and down, and my air bag light is blinking. Last night while driving with the climate control on my car shut off. When i layed off the gas, my rpm's dropped down to 200. And i knew as soon as I came to a stop it would shut off. So before leaving the neighborhood, I came to a stop and sure enough......dead. Now in the process of shutting of, all my lights dimmed. Now i'm thinking the idle control valve is either bad, or not hooked up, or my alternator is going, or i have a grounding issue. Anyone have this problem, or something similar. And how the hell did you fix it. I'd hate to have to bring my car to a shop. Never have and hopefully never will. All help is much appreciated. Thanks
Charlie