06 Monte Carlo SS cranks but won't start what should I replace I suspect anti theft how do I resolve this problem ??. Please help

 

Is the security light on?

they need air fuel and spark to run,

can you hear the fuel pump run priming the system when you turn the key to the on positio?

should be a schrader valve(like a tire valve) under a cap on the fuel rail you can push in to make sure it’s getting fuel pressure after keying the car on,

check for spark, pull a spark plug wire and either use a spark tester that goes between the spark plug and wire or stick a screw driver in it lay it by a metal piece in the motor and have someone crank the car while you watch