Originally Posted by flygry1
Have them check the motor mount. Mine was doing the same exact thing. It had everybody fooled until a rep from Detroit found a bad right front motor mount which solved the problem. The rattle on startup was a clue that it wasn't strut related
Mine did the same thing, but it ended up being a motor mount. The key was when I would turn the engine off in cold weather, there would sometimes be a clunk (or a few of them) as the engine slowed down. This was while the car was sitting still, obviously.