GT-40 Sputtering at ihgh RPM

what year is it?

if it runs good until you get to 2500 rpm, then its your protec ignition system going into limp mode. the ignition system goes into limp mode when it senses High water temp, or low oil pressure. if your temp gauge and your oil pressure gauge both look good. (120-160) on temp (40 psi or so) on oil pressure, then you can test the protec switches.

to do this first find the oil pressure switch above the oil filter and next to the oil pressure sending unit. unplug the single wire connected to it. see if that fixes the problem. if that does it order a new one.

if not do the same with the water temp switch on top of the manifold.

if you unplug both and it still does it, then it is time to convert it to a distributor.

i had the same thing ever since i got my boat off and on, i undid the temp switch and it runs full throttle fine now

Is this 2,500 rpm line, a fairly hard line? In other words, will it sputter every time you get to that RPM? Is your check engine light lighting when the sputter happens or otherwise?

thanks in advance to all for the quick response as I will hopefully try to clarify a couple of supportive points:

year: 2001 - SN 19.6

Relative to "hard deck", YES...it appears that is the consistent point of which the "bogging" and sputtering kicks in.

The one point that I left out earlier that might be of importance is that the Check Engine lights is always ON

Yeah had the same thing. hopefully one or the other will fix the limp mode!

Cheep fix if its one of those!