The fuel filter is located on the left (drivers side) frame rail.It will either have two flare nut fittings,or a flare nut on one side and quick disconnect fitting on the other. With the engine off and key out of the ignition switch,remove the fuel cap to relieve any pressure in the fuel system.Use a couple of wrenches to remove the flare nuts or use your fingers to depress the little white tabs on the quick disconnect flange.You will lose a little fuel,so have a container such as a oil drain pan to catch the fuel.After the new filter is installed,put the key into the ignition and turn to the on position without starting the engine.You should hear the fuel pump pressurize the fuel system.Perform this step at least twice,then start the engine and check for leaks. Good luck.
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Have you tried to manually downshift the trans going up hills? Sounds like the trans is not being told to downshift .
There is a test machine, (Want to say Odessey) that is attached to your truck and the truck is driven while hooked up. This machine can be asked questions by the mechanic. It has more electronics in it than the onboard computer. You would have the trailer attached to reveal realtime operating conditions.
It basically can do what a Dynamometer can do, while pulling a load. Even if it cost substantially to do this test, you would save by not buying parts you do not need.
Find a Dealer who knows about this type of machine and has one to use on your truck.
Likely a clogged fuel filter or defective fuel pump. Confirm correct fuel pressure with a gauge. If the pressure is low, remove the fuel filter and check for obstruction. If it's hard to blow through it, replace it with a new filter. Then retest the fuel pressure. If pressure is still low, then it's likely that you have a defective fuel pump.
IN your distributer under the rotor is a magnet and a pickup coil (the magnet is known as a pole piece) check your pickup coil for corrsion (green in color) and the module and also check pole piece for cracks in the magnet where the rivets hold it together. sometimes oil wicks up around the distributer shaft because of housing wear or the pieces just wear out over time.
I have replaced many injector driver modules on these diesels. GM has redesigned it and i have never had a replacement one fail. This is a known problem for the 6.5 diesel. Unfortunately its about a 500 dollar part from the dealer, and requires intake removal, and some very tight work space to replace.