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Have you looked into rebuilding injectors? Like through Rosewood? Normally, when you start to see injector issues, the other injectors are not far behind..
I had to buy an injector from the local NAPA at a wildly inflated price. I won't even tell you how much because it is embaressing.
I did not drain the reservior or the head. Just pulled the old inector and the glow plug. Used rags to capture most of the oil and fuel befor installing new inector (rebuilt)
Cranked engine with glow plug out to clear cylinder.(Pulled #30 fuse)
Did buzz test to make sure inector worked.
Put it all back together. It started after several tries. Now it is too cold to want to go for drive to see if it fixed problem (minus 20F).
Understand it will take a while to clear air before engine will run normal if this has fixed it.