Alright so I was doing 120km/h in my 2002 Pontiac Grand Prix GT and my revs were at 5krpm then its started to chug and sound horrible so i slowe down eventually killing the engine; i was able to drive it back but wiht a horibble squealing and knocking noise, I was wondering; did I kill the engine, and is the dealership/mechanic able to find out if i over torqued it? like will they know through a computer device if I blew the engine due to the speed I was at?