Start problems 1993 Chevy Corsica V6 3.1liter

First thing to do, To check and see if the timing chain has broke, I would remove the front valve cover, Then jack up the front end of the car, Try to turn the crank shaft pulley, With a buddy or someone to let you know if any of the rocker arms are moving, If not then youre timing chain is shot. If things checkout there, Then I would look at youre intake manifold gasket could have a blown, In which causes a Vaccum leak.

Good Luck.