Engine won't start unless I spray it with carb-cleaner spray?

Hello,

You might have a faulty fuel pressure regulator.
It probably is not providing ideal fuel pressure or volume at start up.
That's why it only cranks unless you spray starting fluid.

Test the fuel pressure.
You should have 55-62 PSI of fuel pressure with the key on and engine off.

Here is a helpful video of how to check the pressure:

https://youtu.be/aITQclp7zIE

https://www.2carpros.com/articles/how-to-check-fuel-system-pressure-and-regulator

I have attached the diagrams for your reference.

Please let me know of any questions.

Thank you.