have had that too...!! Ive brought it up before but didnt get much of a respond. Let me guess it comes and goes right? makes you feel like something bad is gonna happen? It hapens when you stop and then go right? not when turning and stuff... kinda like a 'clunk'? I have had my friends tell me it was my brakes and such but I think its the suspension. I doubt its a motor mount. Tell me what you find, ill look for it too.