'91 firebird won't start

1991 Firebird,3.1L engine,has spark,has fuel,turns over good,but won't start.Any suggestions?Update...got car running.....replaced spark plugs.They showed no fouling or wear,but evidently spark wasn't hot enough to fire.

it could be that the computer is not getting a pulse reference from the distributor, im not 100% on it. i have the exact same car and have not had that problem yet. i will check the book though.

is the fuel getting to the engine? troublshooting in the book says, fuel injectors, ECM, or fuel pump faulty. also, is the distributor loose ? this could cause the timing to be off. it also says to check wiring in th starting circuit. hope this gives some kind of help.