Ok have a 2018 HD8 DPS and neighbor has 2020 HD10 limited. We are both having the same issues start kills starts kills starts kills and then when they do stay running its very jerky for a little while then they run fine. He took his in for 1st maintenance check and they adjusted valves fluid change ran great no issue so I did the same having valves checked and they replaced plugs only one exhaust valve was out of spec. We are now experiencing the same issues. Gonna check map sensor, and fuel pressure, When checking the fuel pressure do I just need to turn the key on and not start it? I checked battery terminals also knowing the problems they've had. Thanks for the help