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Moving a fuel injector pump with out the proper measuring tools is inviting total engine failure. As too far advanced will melt pistons . Check that there is no air in the pump by ensuring that the bleed screw is opened for the bleeding process.. The hesitation may be from the governor not reaction because of low fuel pressure(air) or a problem from fitting the seals . Best advice is to have it adjusted by a professional diesel pump repair shop. The dollars it will cost will be peanuts to what it will cost if you get it wrong
When is the last time a tune up was performed on the vehicle? I would get some amsoil engine foam, and use it as described. Also get some fuel system cleaner and use that as well and go from there. Thank you, Lee
If you got the 3.0 i'd say its the rail oil pressure sensor goin west .
If its the 3.1 check your shut off solenoid on the fuel injection pump as they can fai,l stop the engine then be ok next time you start up .
I have a 1998 Bighorn 3.0L if the wrong grade of oil is used in the motor it miss fires and runs rough, due to the injectors being oil pressure controlled, I have heard of extreme cases causing a failure to start when cold. good luck
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