it could be as deep of a problem as the reluctor wheel on the crank or cam having a small nick in it. start with the simple stuff instead of letting it sit at the dealership for days, i promise your truck is the least of their worries when they have easier money coming through the door. go get it back and swap the coil pack with another, swap the injector with another, pull the valve spring out and ckeck it, make sure the rocker is torqued down properly, make sure the pushrod isnt bent, swap the wires and plugs. thats a lot of simple stuff you could do yourself that doesnt take much time
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