Codyderby1

When they replaced the lifters and cam it had a knock but nothing since then

I dont know if it is due to the dod since i installed my lift and new tires the truck doesn't activate the 4cyl mode any more unless im doing like 30 or below. I would love a new motor but everything is going through my extended warranty which only has 11,000 left on it

My 14 Silverado is throwing a cylinder 6 misfire code. This is now the 3 time with in a 1.5 month span it has been into the dealership to be repaired. They have replace all of the lifters and the cam, 4 fuel injectors and i replaced all if the plugs in it two days before it went to the dealer the first time and when you start it up after it has been sitting for a peroid of time it throws white smoke every where like it did when it smoked the cam. Everything has been covered under my warranty thankfully but even the dealer seemes to be stumped now. They have been communicating and running test with gm for the past week. Any ideas? Thanks in Advance