Hard starting crank for 15 to 30 seconds?

This is a sign of low fuel pressure, or a throttle bore that needs to be cleaned, here is a guide to help us fix it:

https://www.2carpros.com/articles/engine-cranks-excessively-before-starting

I would check the fuel pressure which this guide can help with should be about 48-52 PSI. You can rent a fuel pressure gauge from the auto part store. Here is how the job is done, and I included how to service the throttle body in this video as well.

https://www.youtube.com/watch?v=N2nC4V9DrdQ

And this guide can help with the fuel pressure test:

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

Here is how to change out the fuel pump in case you need it. Check out the images (below). Please let us know what happens.