Just heard from the dealer.

[tanker4lyfe]

Turns out truck had excess carbon on #1, #4 plugs causing a misfire. Only 19,000 miles and oil has been changed @ 1000, 2500, 5000 and every 5000 thereafter w/ Mobil 1 and AC Delco PF48. Also a can of seafoam every 5000miles. They are keeping it and doing multiple tests to it to find the root of the problem. Does anybody have any ideas on this maybe some experience with this issue.

[RyanbabZ71]

No need for multiple posts on the same subject in 2 different area's this one is being closed. Check out the powertrain/engine section if you want to comment