Hey so i just joined this forum. I have a 2008 jeep compas it has 128,700+ miles on it and for hte bast coulpe months when i lift the hood i head a vibrating metal sound coming from under the engine. I put my ear close to it and it sounds like the there is something loose from inside the engine. my thought is that its the rockerarms that are loose. i called the chrystler dealership and apparently the rockerarms replaced waay before 128k miles. so how do i know if this is the problem and if it is how heard would it be for me to fix it at home and where can i find the parts (cause ive looked) to fix it myself.