hi tightline I 2nd giving Gary a call. Same story from me: In June 2017 I took my 1999 200 efi to Gary, when after almost 3 months at one of the big stores couldn't figure it out. After 1 week running like a champ and knock on wood still is. He Knows mercs.
2000 Champion 191 Merc 200EFI
There's only 1 way to Rock