I have an engine noise that is ticking

I have a 2002 chrystler sebring convertible n I was experiencing a slight tcking noise coming from the engine that would in crease with the rpms n the car was abused n the noise became severe n now the engine sound horible n will just die if u try to move at first it would make the litle ticking noise then when the rpms would pass two it would get bad then stop now its just bad one u stat it it dnt even sound like a car its just a loud squekin noise n it wont even make it down the street I changed the oil n spark plugs