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Get a can of Starting fluid from the parts store and spray it into the air intake hose to the engine, if it fires up and stalls right away you have a fuel pressure issue, more than likely a defective electric fuel pump inside the gas tank.
It sounds like it is getting too much fuel. Holding down the gas does the opposite of what you may think, it shuts the fuel flow off on fuel injected cars. You may have a leaking fuel injector or a bad fuel pressure regulator.
CODE PO172 - SYSTEM ADAPTIVE FUEL TOO RICH BANK 1 POSSIBLE CAUSE EVAP VAPOR RECOVERY SYSTEM FAILURE MAY BE PULLING VACUUM.FUEL PRESSURE REGULATOR FAULTY.HO2S ELEMENT CONTAMINATED.LEAKING FUEL INJECTORS. CODE PO174 - FUEL SYSTEM TOO LEAN CYLINDER BANK 2. POSSIBLE CAUSE EXHAUST LEAKS BEFORE OR NEAR THE HO2S,WEAK FUEL PUMP.RESTRICTED FUEL INJECTORS, LEAKING EGR VALVE GASKET OR DIAPHRAGM.MAF SENSOR DIRTY CAUSING PCM TO UNDERESTIMATE AIRFLOW.
WHAT IS THE 4 CYLINDER ENGINE COMMING OUT OF? THE 91 f150 IF IT'S GAS HAS A GAS PUMP AND RUNS AT 60 psi The 4 cylinder may have a high pressure pump with a pickup pump on it so need to know in orderto set that up.