both of the above posts are what I was going to suggest too. definitely replace the fuel filter and possibly get new fuel lines if any appear kinked over or collapsed.
also would be a good idea to replace the inline fuel screen that is inside the inlet to the carbs (if your bike even has this installed still). link to the part I'm referring to: (page 18, part number 9)
http://issuu.com/ducatiomaha/docs/m750_usa-00?viewMode=magazine&mode=embedand yes, the slides in the carbs have vents which need to have equal and ambient pressure on one side of their diaphragm at all times. those hoses are these vent lines, and they both are supposed to lead to the right side gray plastic pod. if the vent hoses see unequal, or positive or negative pressures, the slides will not operate properly, and will usually operate unequally, making the bike run rough and low on power. if they see decent amounts of negative pressure, it will cause the slide to slam shut and stay shut as long as it has pressure. and whether the pressure is positive or negative, or fluctating it will often make the slides flutter making the bike incredibly jerky. cracked or heavily damaged vent hoses, or vent hoses missing altogether, will definitely cause these conditions. the filters are important too, they need to stay installed to prevent dust, bugs, and other debris from getting up into the air chamber above the slides and diaphragm.
I recently replaced the hoses on mine with standard crankcase vent hose from autozone. the ducati hoses are no longer available to buy, so you have to make your own. the hoses I bought were I believe 1 7/32" (31mm) inside diameter, to fit the nipples on the filters. the outside diameter was much larger than the original hoses though, so I had to drill out the holes in the gray pod. once I replaced mine I noticed a HUGE difference in power and smoothness on the highway, cruising and accelerating
