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It is likely a fuel issue. rent a (free) fuel pressure gauge from local autozone to verify if the pump/filter/regulator is at fault.
Otherwise, (next) unplug the maf sensor and diagnose the electronics involved with fueling the engine.
Also:
1. cat is mentioned because they tend to clog, and a clogged cat gives a symptom of an engine dying
2. It wouldnt be the IACV (idle control valve) because the throttle body (throttle valve, "gas pedal") overrides that
without seeing it, most likely it is your fuel pump ( the pump is probably ancient, failrly common failure), followed by a clogged filter(unlikely) or wiring related (maybe the maf ground came loose. Maybe the maf itself came loose and unmetered air is entering the engine). Inspect all tubes that lead from the maf to the engine before taking anything apart.
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