Pls help 

[T-95runner]

Hello. Just. Bought. A 4runner. New to toyotas
Engine gets hot. Took out thermostat still hot can see
Water circulate through radiator ? Won't idle
Either. Also has a little knock sounds lick injector
To me. Not sure if those go out gas milage bad too. Help me

 

[Awz]

What year? engine? Could be a radiator cap, if it doesn't hold pressure it can do that.