A coil misfire will be a lot more noticeable in higher gear or overdrive gears. But if its that bad the check engine light should have been flashing.
You should go ahead and get a scan tool as they are available online from china for under 20.00
Always nice to have a good idea where to start looking.
Mine shuddered and was dropping in and out of overdrive. The coil on cylinder #8 went bad therefore a misfire was present. The check engine light did not come on until later when I took it to the shop. The shudder went away when I hit the O/D off button. Mine is a 5.4L 3V Triton/ 6 Speed, so not related to the OPs truck which is why I didn’t post my past experience. Just sharing this because the misfire didn’t throw a CEL in my case.
Sorry I’m of no help, again different powertrains and drivetrains.
Last edited: