My 92 Miata falls on it's face upon hard acceleration. I have tested the fuel

How's your Tranny acting? Any slippage? What do you mean FUEL SYSTEM? Do you mean FUEL PUMP? How about your Fuel Lines and FUEL INJECTOR? I am assuming you already dumped the usual suspects in to clean said systems. HOW DO YOU KNOW THE PROBLEM IS THAT YOUR CAR IS FUEL STARVED? Yer N/A is an OLDSTER ROADSTER (god, how I love my puns) and if it hasn't been fawned over, maintenance wise, a bunch of things could be wrong with her [FYI, I am on my FOURTH MIATA---three N/As (two 91s, one 93 and one N/B '99er). What about ANY Accelleration? Same problem? I need more info. How many miles on her? How drastic is the face falling---tell me about RPM loss. Is it gradual or sudden when you tromp on the pedal? Could be yer fuel---try running Premium!!! Once you rule out FUEL, you need to suck it up & do a Compression Test which means a trip to ye-old SMOG Testor!!!