I have a 91 Formula with a 5.7 liter and it's dieing out. Last night it was fine and this morning, if I give over a quarter throttle it feels like it's out of gas, but if I floor it will go. It's got new plugs, wires, cap, rotor, and fuel filter. I don't know if it is the TPS, EGR valve, fuel pump or FPR, and I'd rather not waste alot of money replacing all of those things if I don't have to. Can anyone narrow it down.

 

i'd check the fuel preasure first, sounds to me like you need a fuel pump.

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1st & 3rd

 

another weird thing is that it runs better when it warms up, ( it still runs like crap, but it does run better.