These bikes are very good at saving fuel by cutting the injectors on the over-run. This is partly what caused the stalling problem as I understand it.
Have you tried winding the tickover up? Use the throttle cable adjusters below the front brake lever to stop it from closing the throttle completely.
Has it lost performance overall - more than you might expect with lower octane fuel? Perhaps the injector(s) are clogged?
Still got a catalyser fitted? This may be bunged with if you've had leaded fuel in it.
Have you checked for fuel leaks around the injection system?
Checked all electrical plugs are properly seated and undamaged from falling off?
Let us know if you fix it or need some more help!
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