2000 Olds Alero won't start

I have a 2000 Olds Alero that will not start. Has spark, Fuel pressure is 55 and holds steady. Compression is low on some cylinders. It is a 3400 6 cyl. Anyone have any ideas? I changed the crank sensor, balancer, cam sensor, plugs, plug wires, and ignition module and coil packs. Please help?

Ok, you have fuel pressure......you have spark......

You say compression is low on some cylinders? What are the readings for all 6? Are they all at least 100psi?

Do you know if your injectors are firing? Have you tried to spray car cleaner into the intake while cranking?

Check for codes?

The highest compression I have is 100 on cylinder 2. Other than that they are 60 or below on the rest of them all the way to 23. Injectors are all working. No codes. Tried spary carb cleaner while cranking it acts like it wants to start but it won't. I'm wondering if the head gaskets are that bad causing it not to start. Also when I pulled the lower radiator hose off hardly any antifreeze came out.

The highest compression I have is 100 on cylinder 2. Other than that they are 60 or below on the rest of them all the way to 23. Injectors are all working. No codes. Tried spary carb cleaner while cranking it acts like it wants to start but it won't. I'm wondering if the head gaskets are that bad causing it not to start. Also when I pulled the lower radiator hose off hardly any antifreeze came out.

Looks like you found it. Not gonna run on 23lbs of compression...Either valves stuck open, damaged pistons, head gaskets...