I have a modified 496 HO Mercruiser. It has a Raylar 525 kit and numerous other modifications. 600 hp. I have had a couple of mechanics take a look at the engine and have been told that it is above their area of expertise. Everything checks out, but a surging neutral idle remains. Jumps around from 650 - 1100. Settles briefly after opening and closing the throttle. Enough to get an uneventful shift into gear anyway. Seems okay in gear at idle and runs well at speed.

Any leads for a a shop or mechanic in my area(with a solid referral I'm willing to go anywhere in south Florida) that has some experience with modified Mercruiser engines would be very much appreciated.

Thank you,

FracBurner