I've got a '95 - 30 hp Johnson that seems to sputter heavily from 1,000 - 1,500 and from 2,500 to 2,800 rpm. It will also sputter occasionally at any other speed but comes and goes... nothing consistant at any given speed other than what's been mentioned. I've checked fuel line connections, tank, spark plug wires, all electrical connections (cleaned and securely reattached), carburetor body gaskets. I've also cleaned the screen in the fuel pump and inspected the o-rings. I've recently had a "shop tune up" and the problem seemed to increase. They said everything appeared to run correctly when I informed them of this problem. They checked it again and "found nothing out of factory settings". Idles nicely and top ends around 4800. I believe it is something in the electrical system... somewhere. I went ahead and bought a Clymer shop manual recently and vow to either use my own tools or borrow the correct ones to do my own work. The shop manual doesn't describe my engine symptoms, but just tells me how to take everything apart and put it back together, so I'm at a loss and at square one. Open to suggestions.