Hello I'm new here. I recently purchased a 04 powerstroke 6.0 that was not taken care of. The truck makes a loping sound when cold. Once the engine warms up it sounds mechanically right. But when I drive it down the road after the truck had completely warmed up and driven a few miles, it hop/shake/shudder when accelerating but will smooth out. The more I drive the worse it gets. It will slip out of gear if I'm cruising at any speed. But when the truck problems occur, I hear electronical clicking noise under dash. Last owners said they just had new injectors put in. I just put new fuel filter, air filter, and oil and they where all black. And the antifreeze has decreased. If anyone could give me advice, it will being appreciated. Thanks

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Anyone have any ideas?