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Darned good question. Well, it will confirm that you are getting fuel pushed out to the injector, and not being stopped by a clog in the line or something wrong with the pump. As you crack it open, the loss of pressure to the injector will mean the injector no longer provides fuel to that...

Well, you can check the compression and test the injector spray pattern for free while you're waiting for more moolah to magically appear. I think Harbor Freight probably has compression testing stuff for cheap. Another easy test while you're right there, is to start the engine and barely crack...

Have you considered the possibility that this may indicate a blown head gasket? That happened to me on my M35A2. The break in the gasket was between two cylinders, so no coolant leak or anything funny. It just ran poorly. To prove or disprove it, you should do a compression check on each...