2000 Honda accord 4 Cyn

Why is my car still running hot and idle so high up n down when in park? I have gotten a head gasket job,New water pump, hoses,cap,cooling fan, thermostat all that and it still run hot. Also one day I seen black liquid when I took off the radiator cap one day, please help I’m a woman I don’t know nothing about cars and the shop that that I took it to just keep messing it up.Please Help i’m spending more than what i paid for the car just to get it fixed. I need my car and I’m willing to do whatever it takes to fix it.