I was driving my kia rio down the interstate at about 70-75...I noticed it'd miss a few times...I smelled something burning and pulled in at a rest stop. When I pulled into the parking spot it died. I popped the hood and it was steaming from under the engine cover on the left side. I took the cover off and it looked like the cam gear i'm guessing had burnt through the plastic cover on the side. It turns over but won't start. Any specific ideas? Car has 80,000 + miles