I got a pair in 03 twin step TG on only one turns up 4500 the other 5200 they have 80 hrs on them any help besides plugs and filters.

Make sure your props and outdrive ratios match.

Are you trusting the tachs?

Make sure both thottles are opening the same amount.

When I had that same problem, it was my props, like Ed said.

I got it ,I replaced fuel psi reg fixed probem just for you that may have problems in future .Or call Maryland Marine 410-320-2495 and.5300 at 89.5 gps full of fuel.