93 MARINER 25hp 2 stroke is only going 5PMH at WOT?!?!?

by Mike
(Fox Lake, IL)

Throttle is wide open, and I'm lucky to get 5.5MPH. My boat was so smooth up to 23MPH last night on my way in.
I have:
Changed prop(had new one anyways, worried hub might be slipping)
Changed both plug wires, and put on 2 new plugs.
I can smell unburned fuel.
I have found a broken plastic cable retainer clip, not sure if it links the 2 throttle cables to piggyback them as the throttle is opened?

1993 Mariner 25HP 2 stroke
Thanks Mike