As a note: I currently have trucks that I have purchased from both dealers.
The first dealer tried hard to find the problem. They replaced the ECM, Coil Packs and Had 2 Mechanics check it out and both pulled the intake manifold to check the Cam. Guess they couldn't see much as the Cam was severally pitted. Because they had the truck so long, they didn't charge me or Chrysler anything. One issue however, they wanted me to approve pulling the head to see if there was a problem, but, If they didn't find anything, I would have to pay for the labor. I declined. Being that the truck was running fine, they suggested I drive it til it gets worse.
Second dealer:
I had an appoint for a wheel bearing and ball joints so I told them about the miss-fire issue and what the first dealer said. They said they would find and fix the problem. The only issue was they had to get and approval from Chrysler as the repair cost was over $3,000.
This added a few more days.
They did not ask for any service records.