The motor was being driven, but it didn't have enough power to actually start moving. It wasn't in neutral. In neutral it behaved as it should. This happened in forward or reverse. Obviously, increasing the throttle enough to start the wheels moving returned it to normal chuffing. In another odd twist, reducing the throttle again in forward or reverse so the wheels stalled, the chuffing didn't continue. It was only from a power up that I was able to get the "false" chuffing. The engine is on it's way back to the customer, so that testing is over.
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