Still having issues with the stalling mark?
My car has had similar issues, mainly when its raining though to be honest my vento is also a 2E, would approach a junction and the engine would die sometimes wouldnt restart but would crank over, also when it was going to die the oil light would flash on.
First of all i changed the Ecu relay (no 30 on it) didnt fix it
Second changed the distributer and rotor arm (this improved it alot but not total cure)
Changed the ignition coil ( this sorted it)
Changed leads anyway as they looked old and had the distrubuter adjusted too now runs sweet as a nut.
this is my story but hope this helps