won't start ahhhhhhhhh

[next generation]

hey guys, i am new here. i own a shop and went to start this 2005 saleen extreme today to pull in the spray booth and it wouldn't fire. only yesterday it fired up with no problems. i have pulled the fuel line and i get fuel, i have spark, i pulled the plugs and cleaned them. i can't figure it out. i checked fuses too. it does have a viper alarm, could this be the problem? if it is can i simply disconnect it so it will not interrupt the pcm?
one other thing, we were fixing a fuel filler neck issue earlier yesterday, i have looked every thing over and it is so simple that i can't imagine it to be the problem. i also checked the inertia switch.
this is so frustrating, i just want to paint this car and make it leave. please help

 

[SpartaPerformance]

Hit the "Set Up" button just above the radio controls it should bring up a menu for "System Check" run the check it will you if there is an issue with the fuel cap or such area. If that isn't the problem then hook up a scanner hopefully it will pick up something when it runs a system diagnostic.