I started to hear some rattling noise from the engine and when I raise the engine RPM the rattle will go away. It sounds like the timing chain is hitting against the timing chain cover. I'm a little afraid to drive it now because I heard it may take out the engine if the chain break loose.
I'm thinking about replacing the chain, but while I'm at it what else should I replace with it?? And what are things that I should take precaution? Any inputs would be greatly appreciated.

Alex