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Took it in for first service, the dealer said this issue made no sense mechanically, and he'd check with the distributor to see whether a sensor might be to blame.  My next step will be to take a couple of videos to show him.

In the Australian market at least, there is a "feature" which prevents the engine from going over a certain speed if the driver seat belt isn't in the buckle slot.

This is really bad, because there is another feature: the seat belt won't extend if the vehicle is sideways on a slope of more than say 10 degrees.

So just when you most need the seatbelt, you can't put it on!  And so just when you most need the engine to work properly (ie to go up a hill), you have the limiter causing it to cut out.

I guess I could get a buckle and stick it permanently in the slot.  Or complete the circuit by attaching the wires.

What have others done about this problem?  Is there a cheap buckle on ebay which would work?

thanks...

When I go down a steepish hill without applying the throttle, it usually stalls towards the bottom when I'm about the apply the throttle again.

Sometimes the engine is very rough (if it hasn't stalled).

Why would it do this, and can it be fixed?  thanks.