My lexus will start then die like its not getting fuel. When you step on gas pedal nothing. . Could it be a bad ecm?i reset computer but it only links for a min then no link. What is causeing this?

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Car ran then just died on road. Sounds like fuel pump going out so replaced but still when you start car it runs then sounds like it chokes and dies or like it loses fuel. But engine light will not come on when key is in ignition. Car will only turn over. When i reset computer engine light comes on as it should car starts then dies and engine light fails to work and dio machine says no link?