1998 Super Sport with no power above 2200 RPM

[TM]

I have a 1998 Nautique with the GT40 engine, 406 hours. I am going to try to describe my problem as best i can. Here we go, the engine will start and run great until it reaches around 2100-2200 RPM's and then it is as if it has a rev limiter on it, it doesnt go dead it just looses power, misses, cuts out sounds like a "chip" reaching its limit. If you pull the throttle back to below or near 2000 RPM it will run smooth (at a whole 7 MPH)
The check engine light is not on and hasnt been on. If you rev the boat in netural it will go well above 2200 RPM and seems to be smooth. I can also go in reverse well above 2200 RPM.
It only does this under load going in forward. I was thinking it was a fuel pressure issue so when i got the boat home i checked it and at idle i have 38psi. I couldnt check the fuel pressure at load since it was in the yard with a water hose connected to it. Has anyone had anything like this or does anyone have suggestions as to what to check? The repair shop cannot even take the boat for 3 more weeks and it wants to go to the lake!

[DanielC]

You have to check the fuel pressure when you are having the problem. It is a hassle, I know, but either you can do it, or you can pay the shop for their time to take your boat to the lake and do it.

[TM]

OK, took boat back to lake today and reading 40psi on the rail at all times. Does anyone have any suggestions?

[DanielC]

If you have good fuel pressure, you might want to check out the ignition system. Your cap, rotor, and spark plug wires are 14 years old. If the spark plugs are still original, change them first.

[TM]

This turned out to be 4 bad injectors. I never thought the engine would start and run so good unless it was under a load with 4 bad injectors. Replaced them and all is well!