1735M, same power loss issue, struggled for a long time with trying different things to figure it out. I tried replacing almost everything on the fuel side, thought there is no possible way it could be just the injectors makes no sense its gotta be ECU or something. Mine was so bad when it started acting up it would stall out eventually.
Well I finally decided to try some aftermarket denso injectors anyway (as Massey is ridiculously priced. Low and behold the tractor is fine now. I got a mecanic out after to program the fuel trims , if you DIY take pictures of all the numbers on the injectors makes life easier for them. Also get new copper washers/ gaskets and rubber o rings for them (i did go to massey for those)
Put about 20hr of hard work in with it since with a 6ft bush hog, even got it hot working in the bush with a radiator full of fuzz, and still fine.
The injectors cross to a cat industrial engine as well if you got a caterpillar dealer close by they're quite a bit cheaper than massey also. If you're DIY get some swivel head ratchet wrenches metric ones and have a swear jar handy
Denso 295050-1160
Cat 457-5836
Massey o ring (need 3) 7064870M1
Massey copper gasket / washer (3 again) 7064940M1
Massey Injector line gaskets (need 6) 7064928M1