2000 0x66 225

[rml2112]

I have a 0x66 225 that will run rough from about 1700- 2100 rpm
It idles o.k and top end is very smooth 5500-5600 rpm.
I replaced the low pressure fuel pumps and spark plugs.
Any ideas were I should Look next?
thanks

Bob

[boats.net]

Clean O2 sensor, check synchronization.

[rml2112]

I assume you mean throttle synchronization?

[mitch]

http://www.boatsetup.com/O2sensor.pdf

for service of 02 sensor