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I have a Proto 2000 GP9II that reacted in a similar way. When I took the shell off I discovered that one of the wires had shorted to the frame. I moved the wire, insulated it and tried it out on the layout. Ran like a champ. Recently the loco started to act up again. Symptoms were similar. This time the wires were ok and the problem was not electrical. I then noticed that the front geared driver was locked. I removed it and the plastic gear on the driver was deformed and would occasionally jam and prevent the motor from turning. I bought a new driver set from Life-Like for $1.50 put it in the loco and it now runs like new. Hope this helps. Good luck...
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