Well thought all was good but NOT.. still doing it, but at times never totally clears up, I'm really thinking FPR.. got a new one, will install it when I replace the hydraulic valve lash adjuster on the front pass side, hoping to fix that damn tapping lol.
I may even pull the injectors and check/clean..

Fuel pump seems good, new filter. Pulled and checked catalytic converter and it looked good, pulled muffler and it was all rusted inside, swapped it out with a 2008 Crown Vic cop car muffler, sounds very nice now. So no exhaust blockage.
Anything as in timing that could cause this ? The distributor's inner disc looks clean under the dust cover so I left it alone.
Seems to me it has to be something with the fuel pressure regulator or throttle body ?