200hp ProXs 2B783266
I have recently developed an intermittent miss (the hardest to pin point) I changed plugs and leads 40 hours ago along with its first service where fuel filters were replaced, yes on board and engine. I have since tried with the onboard filter but no difference.
So, get on plane, all good, say just cruising anything from 3600 to 4300 type rpm’s and engine starts to slow and both smart craft and vessel view show decline by 200-300rpm, no shaking or spluttering as such but almost like the handbrake is coming on. Then if I tap the pedal, a flat spot type miss happens and away we go if I give more throttle. This happens most everytime I move from spot to spot.
No codes or alarms, tried different fuel brands and 1 higher rating, still same. Haven’t pulled plugs yet as I expect to see no variance as it runs fine either side of the miss.
I know these are almost impossible to diagnose but hoping someone may have had the same and resolved there’s.