saab 9000 cuts out

My saab 9000 2.0 injection 1992, cuts out while I'm driving, there is
no indication it is going to cut out, just stops, as if I've turned off
the ignition. When I pull over and try to start, it turns over fine
but will not catch at all ? I wait for a period of time, approx 5-10
mins and then it starts fine, and runs as smooth as ever, no
spluttering, just as if nothing had happened. I've been pointed to
either the ignition amplifier or fuel injection relay, does anyone know
what tests I could do in this situation to prove that it's either a
fuel or ignition problem. Thanks