First, I am completely blown…
First, I am completely blown away with the lack of basic spelling and grammar in these comments. Education is apparently not a priority these days.
Second, the guy is flipping out over nothing. The description sounds like he experienced a multiple cylinder misfire, in which case the root cause will usually be a faulty coil, plug or injector, maybe low fuel pressure . You cannot replace "cylinders"
If it is internal engine damage he will get whatever it takes to repair it as good as new, up to and including a short block from GM PQC.
Third, vehicles are not like a Walmart purchase, you can't just exchange it, even if it turns out to have a problem.
His truck will be fine, and even tho it sucks, it happens. I'm sure the dealer will put him in a loaner while his truck is in the shop.
Next time buy a Toyota. You get what you pay for.