Yamaha HPDI 300 year 2004

When coming out of hole seems to operate normal most of the time. Plenary of power to plane out. As the boat planes it seems to have like half power or like 3 of the 6 cylinders are not firing. No matter what you do once on plane the power seems to be half.

New power head installed 20 hours on it. No problems at all until now.

Is it fuel? Kinda seems like it
Is it a electrical component?

Any ideas?

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