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It can be a number of things unfortunately. Check the fuel pressure to make sure you didn't have any sediment in the tank get caught into the fuel filter. You could also have a bad fuel pump and if you do, you will notice some power loss when accelerating or hesitation.
You could have a bad idle air control valve. Since you haven't ran the vehicle in a year, this could be it, especially if you can't idle the truck.
You can have a vacuum leak at the top of the engine under the throttle body. That hose gets dry rotted or a animal could have made shelter in there and caused an issue with that hose.
It could be PCV valve plugged up due to sitting.
It could be air filter plugged up from sitting due to moisture build up and leaves.
This list can go on and on... These are some first things I would check.
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