D2.8L fuel injector no start?

[Breezy98]

I have a 2004 D2.8L D-tronic and have been trying to diag with the old part it would start then after revving itself ip (we turned it off before it got too high). Have narrowed it down to the fuel injector most likely after searching for a week and many hours later managed to track one down and went to put it in now it won’t start at all. Crank no start. Local injection shop said they can’t fix it due to not being able to track down parts and I’m not sure where to go from here. Have read the manual and set the timing back to how it should be. I’m at my last hope with fixing this boat I am a diesel mechanic and still can’t figure it out! Someone help!