Thanks again for your help with my first question re: vibration on my 2001 Nissan Pathfinder. I have another question...I'm told that I am to eventually replace my lower intake (manifold) because it apparently sticks. I know there's the upper & lower or AKA left & right. I order my parts online & save huge! However, they advertise there parts left & right...so which one is which when I need to only replace the lower end??????? I can't rely on my picture comparison...I live in Ontario & order/ship from the States. I HIGHLY recommend RockAuto.com they have nearly everything for ALL vehicles for a small fraction anywhere else. I'll give you an example...we needed a new bumper, everywhere was no less than $200. min. & up, I bought the exact same one on my truck for $70. Anyways, any advise would be greatly appreciated.