I've mentioned my experience with a coil that liked to fail just enough to cause a very noticeable misfire, but not enough to throw a CEL in a couple of threads now. It liked to act up at about 1500 RPM, too. I could force a downshift and make it go away, but that probably shouldn't rule out a similar coil problem in the OP's case if other causes can't be ruled out.Do u have access to a scan tool to do a live view of when the event is happening? If it is a misfire, you should be able to see which cylinder the ECM thinks is the issue by an increasing misfire count. Could be a coil pack failing as well.
there is tsb on fuel pump had to replace the one in my 2016 5.7Hey guys, new to this forum. I have a 2011 DC 5.7 4x4. The only engine mods are the charcoal filter delete and a K&N dry air filter. A couple weeks ago, I started feeling a light stutter or surge under constant rpm loads. Cruising on flat roads at maybe 1500 rpm I can feel it lightly, but not all the time. If I give it more gas to go up a hill, holding say a steady 2,500 rpm, it’s more noticeable. Only about 3 times now in two weeks have I ever gotten an rpm change with the surge, and those 3 times have only been on hills where rpm’s were in the mid 2000 range. I thought it was the tranny at first, but have eliminated that. I’m guessing it could be the fuel pump, or sensors. Possibly a dirty MAF or TB. Anyone have this issue before? One other item, just in the last week, it runs rough at 1,000 rpm on startup after sitting overnight. Runs rough for 10-20 seconds. Then smoothes out. Only runs rough after sitting for hours, not on startup throughout the day.
