Is the fuel rail pressure testable in Corolla?

What is your question?

Car has new battery and cranks but has slow startup! On the intermittent times, when it takes 3 1/2 seconds to turnover, the engine sputters to life? Think the fuel regulation from the pump is weak.

What makes this problem better or worse?

It's worse when battery worn to mediocre charge.

How long has your 2015 Toyota Corolla had this problem?

A few months