[elhigh]

That's really strange. The revs are certainly there.

Somebody mentioned tapping the gas, that the clutch may interlock on the fuel delivery and/or the spark as well as the starter when you turn the key to ign. ON. And if it does, that sounds awfully belt-and-suspendersish to me. You could maybe disable that interlock switch. That will probably be the cheapest solution if that is the case.

Try this: keep the car in gear while coasting and turn the ignition OFF - the engine will continue to spin as always. Don't put in the clutch or shift to neutral. Let everything settle a bit and try turning the ignition back to ON.