miles5241

I've been running 93 the past few tanks, thinking that was perhaps what it was, issues still continue. I want to bring it to the dealer and have them ride with me for a solid 20-30 minutes, since it seems to happen more when the weather is warm and the truck has been warm for sometime. The past few mornings have been cool and the issues seems to have gone away until it warms up in the afternoons.

Hello Everyone! First off I have a 2015 Silverado 5.3 4wd. So when I first brought the truck home after about 50 miles I developed a misfire. I brought it in and they found a bad spark plug and bad coil. This has been great until about 2k miles later and I started to develop what I thought was it cutting throttle after it shifts, shifts drops into 1700 RPM range stutters then and gives a misfire type feel. Bring it in and told it was the torque management system doing what its supposed to. I accepted this and kept driving it. After this last weekend I had the opportunity to drive it 200+ miles at speeds of 70-75 mph and what I noticed that the same hesitation/misfire would occur if I give it a certain amount of gas at that speed. At this speed the RPMs were right in that 1700 RPM range that I was noticing the "Misfire" after a shift. Well after coming back down to speed it would consistently happen happen while accelerating from a dead stop at a "normal" pace. This was after running the ruck for 2 hours on the highway. No CEL. So I take it back to the dealer to get some service done and have them to explore this again...The answer I get was they could not replicate the issue and the only thing they think it may have been is the transition between 8/4 cylinders and since I don't have exhaust flap I may be noticing it more, I have an aftermarket exhaust. This was after 2 days and the shop foremen driving it home for the night and back the next morning. Which my response was the truck was in here prior to the exhaust and know what the transition feels like, and what is occurring is disruptive and can be felt by everyone in the vehicle. Of course at this point there isn't anything they can do since they can't replicate it and there is no code. They want me to drive with a tech to see if its my driving style. I had 2 others drive it and it happened to them too... So not sure what to do or what it can be...everything points back to ignition/fuel in my mind since it had issues from the factory. What you guys think?

What size are these? Stock?