I've recently purchased a low mileage and fairly mint Porsche 911, 997 manual. However, there is a slight starting problem, sometimes it turns over a couple of times and then stops, turn the key off and on again it starts normally, this can be a cold or warm start.

The dealer is being very helpful and trying their hardest, (I noticed it on the test-drive), they have changed the battery, both clutch switches and the ignition switch but still the fault prevails, does it sound like a starter motor problem to you?

The odd thing is they have just sold two virtually identical cars and are having the same problem with the other one, could it be something to do with their service and prep? The cars appear pristine, detailed, including the engine bay, which is steam cleaned.