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With the information at hand, I would guess the problem lies in the transmission. Under light/moderate throttle, the transmission will shift into 2nd around 15mph; maybe it is slipping in 2nd?
I have never heard a problem described like yours, of the engine cutting out at a certain speed.
To test the transmission theory, try putting the shifter in the "1" position, then run it up to about 30mph. It will sound like the engine is screaming, but you won't hurt it unless it is ready to fall apart anyway. If you can't replicate the symptoms in 1st gear, then it may well be the transmission. Try shifting into "2" after that and see if the problem appears in 2nd gear.
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