2004 4 stroke yamaha 115 idles low and doesnt do the rpms it used to...

[305seacraft78]

my 2004 yamaha 115 4 stroke idles low and doesnt do the rpms it use to. does anyone have any ideas what might be the problem. no mechanic in key west can figure it out...ive spent a lot of money on trying to fix this...they say everything is ok

[rodbolt]

use the yamaha dealer locator function.
find a dealer near you with a master tach, pay NO attention to five star.
could be one of many thgings.
this motor is EFI, it either works as desighned or its simply broke.
most of us master techs actually understand how the system works, not all.