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OK, then can only be air or fuel. Like Rusty posted, the compression should really blow your finger away from the port. I guess, if it were me, I would get a compression tester and test. Its the simplest thing to do next. If you cant get one, try going to a truck repair shop and getting one of the guys there to come do it for you after he gets off work. Will cost a little something but its the next EASY thing to test.