Actually, they are both common problems.

I had the same problem about 2 months ago.
6 new injectors and she starts right up.

You can test the FPR with a gauge. See if it holds
pressure over night. If it does, check the pressure on
it with the vacuum hose attached and not attached and
see if it falls within spec.
If all that checks out, the problem is likely the injectors.
If the FPR doesn't hold pressure or pass the pressure
tests, then that is most likely the problem.

1995 Trooper LS auto 3.2 DOHC /w SOHC intake
1989 Trooper 2.6 auto
1989 I-Mark RS DOHC 1.6
1991 Stylus XS DOHC 1.8