Not GSX. If you have TCA or comparable, with fuel switches and virtual buttons, try tese 2:
1. Engine switches are bound to "Set engine Master", "Set Starter 1" and set engine X fuel Valve" (not for me this one but maybe doublecheck yours) instead only to be binded to "Set engine Master X"
2. in the TCA control panel there is a checkbox "virtual buttons". THose are the buttons between the detends. Turn it off.