I'm working on a Lionel standard gauge Commodore Vanderbilt that was issued about 11 years ago. This engine had never been run. Put it on the track and when it started to move it was very jerky. I took it apart and made sure everything was lubed. Checked the gear box for dry grease but that was fine. Tried it again and it ran the same way.
I checked all the board connections. I looked for loose or pinched wires. Checked the pickup wires to make sure nothing was shorting out. Everything seemed to check out fine but it still doesn't run right.
It stutters when starting to move, running slow, or going slowly through a curve. Once on a straight way where it can pick up some speed, it runs smooth. When it stutters it also sounds like the two motors are fighting each other. I also tried a reset but that made no difference.
Any ideas what else to check?