1998 Malubu Starting issue

MY 1998 Malibu will start up just fine and then I will shut it off and come back to start it up and it will just turn over but not fire, any suggestions? thanks

I have a 2001 malibu and have the same problem, with mine i know its the theft system. If the 98 has the theft system thats most likely your problem. When the car doesnt want to fire you turn the key off then back to the on position and leave it for about 8 minutes, when the "theft system" light stops flashing, then turn your key back off, then crank it over it should fire then if thats the problem. When it doesnt fire, is there a theft system light flashing on your dash panel??