03 grand am no start need some advise?

friend has 03 grande am was running fine went to work got out of work car cranks over but no start we can get it to run with starter fluid we have correct presser at feel rail. any ideas thanks03 grand am no start need some advise?
Check for computer codes, if you dont have any then try fuel injector cleaner in the gas.03 grand am no start need some advise?
The injectors probably arent squirting. Maybe the cam sensor is out. I think the cam sensor is used to determine when the injectors fire. It may run without it in limp mode, but if it is defective it may not work at all.
do you have a CEL on? just because the pump is working does not mean that the injectors are . the computer can loose the ability to control the injectors, a dtc p0216 injection timing control circuit could cause this.
it sounds like either a spark problem or a fuel problem but if it runs with starter fluid but wont start by its self on gas its prolly a fuel issue check lines and filter check and listen to see if the fuel pump is running
maybe its a clogged injector if the fuel pressure is up to par? try cleaning you injectors. good luck

baby sunscreen