Troubleshooting my car! help make it run!

Check your voltage at the battery too, you may be over charging. OK, now I'm running out of ideas, lol!

When it starts running bad, get it in the garage and see if you're running lean or rich. An unlit propane torch works well for this, just open the valve and point it in the airhorn. If it speeds up, it's running lean, if it runs worse the mixture is OK or rich. Don't smoke and keep your face away just in case there's a back fire.

Pull out a spark plug. Is it clean, tan, or all black and sooty?