1990 beretta GTZ stalls and wont start

My 1990 Beretta Gtz which i have owned right off the truck in 1990. Has all of a sudden started to stall and wont turn over. I leave it for 1-2 hrs go back to it and it starts. Just before it stalls it gives a hesitation and then stalls. Any ideas where to start?

have your ignition coil and module checked out auto part store can do it for free that is what happen to my 1990 gt i have with 3.1 v6 i replace the module and all 3 coils and it run just fine and now i get 22.93 miles a gal in the city, and it has a lot more h.p.