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We need to look at a few things.
First check the fuel filter for any water. It will be separated on the bottom.
Next lets do a compression test, just to rule out a physical problem internally.
Then we want to do a spark test. Get a spark tester at an auto parts store if you don't have one. Crank the engine and see if you have a good spark.
When you do post back your results and we'll go from there with further tests and repairs.
Also get me the complete model number of the engine.