rattling

We purchased our car May 2013 and have been having a problem with the vibration since about the 2nd month we have owned it. I have brought it to the first dealer about 7 times with no luck. I finally brought it to a second dealer at least 4 time and they again cannot fix it. It is really...

The 2005 Buick in question started with a rattling engine noise and loss of power; engine did not overheat and or leak any fluids. Rattle noise heard on higher RPM but not heard on idle. Previously, P0420 code for which nothing done due to running fine. any ideas to look for greatly...

My 99' Park Avenue Ultra has a squeaking/rattling sound under the hood, I thought maybe it was a belt or something that needed to be replaced but i'm not sure anymore. I will attach a couple of videos that I took of the sound, let me know what you guys think it might be. Thanks a lot...