Hey thanks for reading
First off the car has an idling problem when it gets warm it idles down then back up.
Second, the computer is giving of code 20 which is electrical overload? The engine light is not on, the car runs fine other than idle problem. Starts perfectly. It has an amp hooked up to it with new speakers and tweeters, unknown amps for everything but its not hooked up to a cd player, could that cause that code for some reason? Any help would be great thanks!

CD not much of a draw. Your amp could cause more of an overload. Disconnect and see if
Code goes away, may need to be cleared? See about idle problem, with amp disconnected.

Is an electrical overload something to worry about? Or?

Doesn't sound like a good thing, If just at threshold, probably no problem, How is your battery? They may make higher Amp output Alternator for your car.

All fixed up thanks for advice