I've started having trouble.  Started with Misfires.  I changed all
plugs, changed the fuel filter, air filter, and cleaned the MAF.
Cleared the Codes and and it came up again.  I checked my injectors for

leakage and none.  My O2 sensors were reading too rich and too lean.
That finally cleared.  I went to relieve the fuel pressure and I had
none.  I was going to check the fuel pressure regulator.  It's still
not running right.  Feels like it's missfiring and doesnt' have a lot
of power.  I've added fuel injector cleaner and sprayed it into the
intake.  Any thoughts??