2004 Chevy Malibu

Are you getting spark and fuel to the engine? You may see gas but is there enough pressure?

Here is a how to for checking fuel pressure and for spark.

https://www.2carpros.com/how_to/how_to_check_fuel_pressure.htm

https://www.2carpros.com/how_to/how_to_test_an_ignition_system.htm

Let me know what you find. Also, if you need the gauge, most parts stores will lend or rent them.

Joe