2008 silverado 5.3 flex fuel 1500 P0301 replaced two spark plugs in #1
I own a 2008 silverado. About 57,000 miles I received the code where it was turning off stabilitrack and traction control. The truck was misfiring. I took the truck to a delaership they had said the #1 spark plug was cracked and was replaced. Afterwards, there was still a stumble and severe oil consumption about 2-3 quarts every 3000 miles. Fast forward about three weeks ago with 87,000 miles and 25 days left on the drivetrain waranty. The same problem occurred. I took out #1 spark plug and it looked really bad. I replaced all of the spark plugs marked each spark plug with the piston #. The truck still had the check engine light on and gave me the misfire code on #1 (P0301). This week, I took it to a different dealership than where I had first reported the problem. the tech told me they had several bullitins for this particular truck. He told me they would replace the lifters, redo the valves and replace the valve covers. Then I would have to go through the oil consumption. Now, I am thinking this might not really make much of a difference in solving the actual problem. Plus concerned I only have 25 days left with the waranty. I guess the tech says it really is a manager call on what the next steps will be.
So far, it is has been in the shop for 24 hours and still waiting to hear back from the service center for GM. I like the truck though do not like what it is doing since I know my other vehicles never had this problem with misfiring, rough idle, bad gas mileage, lifter ticking, excessive white smoke on startup duing cold weather and oil consumption. Plus, it overheated on me when I pulled a trailer smaller than the GVWR requirement. I really was overheating at 220 when pulling over small hills.
Also, it is normal for 210 reading all of the time? What should I press for the dealership to do?
This is on a crew cab 2008 silverado 1500 5.3 flex fuel 4x4.