Boating last weekend. Running WOT at about 5100 rpm, hit some wakes at full speed. Usually no problem in my 17.5 key West. Just out of the wakes lost power and rpm. Had do get back at full throttle in plow mode, could not get on plane, and 4000 rpm. Every 10 seconds or so it would surge, or try to tach up, but go right back to 4k. Fuel is good. Powerhead element is full and flowing, changed the main water separator filter on the lake, no difference. All connections, linkage, plugs, ect look fine and plugs are new.
Any ideas where to start?
Any ideas where to start?