Missing at slow speed

[Hal380]

Boy do I have egg on my face - I have always said "A good answer starts with a good question" Here's the data

150EFI Mercury outboard -1990, rebuilt in 2004. Starts right up, idles well even at slow speed - a little rought, but doesn't stall. At slow speed it vibrates even to the point where you can feel it in the boat - not real harsh, but noticable.

Regards and Thanks

Hal