Quote Originally Posted by SlowNA06 View Post
This is not likely to be a LIM gasket failure. I wouldn't be worried about it in your position.

To clarify, what we have is a rough idle in PARK, but no symptoms in DRIVE.
True: the LIM gaskets is not the cause of this problem....but every 3800 owner should be worried about it if they don't know what conditon their LIM gaskets are in.