Hey Scotty, I'm working on a 2001 Pontiac Sunfire, It's a No start/Start 5 second shutoff no theft light, I've replaced the fuel injectors, fuel rail fuel pump gas runs through it, Spark plugs, wires, Coils, checked if i had spark, and it has spark. Changed the Map sensor Checked the compression all 4 were at 150-153 psi, pretty stumped on it at the moment. took off the head cover to expose the rockers, they move so the timing belt is not broken.

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those blow head gaskets all the time. BUT pray it's something else, do this video https://www.youtube.com/watch?v=064Ilsz8Fzg&t=60s