I have a 1980's Lister TS2 mated to a Dyna generator head that was removed from an old light tower. It has needed some tlc to keep it going but recently it started this new problem.

After it has been running for a while, when I de-energize the run solenoid, the engine shuts down but it sounds like it wants to restart by stuttering a few times.

It does stop but this is a new problem for me. I know that the fuel pumps should be disabled when in the stop position but I don't know why or how some fuel is still intermittently getting to the cylinders. Can anyone shed some light  on this problem?

Thank you