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Check for adequate fuel supply to injection pump check for clogged fuel filters kinked ro collapsed fuel and supply lines also return lines from injectors for blockage. And now for the biggy. Its possible that over time the injection pump has worn out. the engine must be timed to remove the pump correctly. while the pump is off have the injectors checked for opening pressure and spray pattern. I am telling you all of this under the assumption that the engine is mechanically sound ie compression and valve adjustment all could play a part. Good Luck!

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