water getting into engine on 2001 Cadillac Catera

i have a problem with water leaking into my engine and then my cadillac catera 2001 starts to shake and is now not running. how do you stop the leak and how much does it cost to repair the problem?

Asked by for the 2001 Cadillac Catera
If the water is getting in to the engine that usually means that the head gaskets are worn out, which is about a $2500 job, sorry to say.