2001 250 ox66 RPM loss

[usmc6132]

I have a 2001 250 OX66 and since the beginning of the season it will intermittently drop from 4500 down to around 2000 rpm for a short period of time. I let the motor idle for a minute or two, put the hammer down and it's fine for another few miles. The motor never stalled, except for this last trip. Turns over and idles fine. The problem does not always occur or even reoccur on the same trip sometimes. Thought bad fuel, drained some water out of separator and even put a new one in, thought it fixed the problem, but no. Checked filters, all seem fine. The fact that it happens randomly and is fine for a few miles after putting around has me kind of baffled. Any input would be greatly appreciated

Brian

[boats.net]

Need to check alrm system to make sure buzzer is working, touch pink wire at temp sensor on cylinder head to ground and turn key on, buzzer should sound.