I owned a 2000 powerstroke for 150,000 miles, and have worked on a dozen more.
great trucks, and I have never seen a bad injector. I bet it can happen, but I bet it is not happening to you.
Very common are glow plugs. be sure to buy Beru which are motorcraft. The rest of them are junk.
Very common is the wiring harness comes loose from the valve cover gasket.
VERY VERY common is a glow plug relay goes bad.
If you want 20 percent better mileage, get a tune from DP Tuner - Jody Tipton. He changes the timing and pressure. It also gives a LOT more power and makes the truck a lot better to drive.
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