Greetings,I’m having a problem with a Bachmann engine and I hope someone can give me some help. I have a New Old Stock (NOS) Bachman Spectrum N scale F7 Diesel chassis that is having an electrical problem. When I run the engine on my layout, it runs strong with no problems for several seconds. It then stalls and stops, but then starts running again. The amount of time and distance varies from one or two seconds to several seconds between stalls, and it doesn’t always stall in the same locations. If I place the engine in tandem with another powered engine, it will cause both engines to stall and stop. I have taken the chassis apart to lube it, and to check all the electrical connections and contact points. But I don’t see anything that looks like a problem. Can anyone please offer any suggestions as to what might be wrong? Thanks...