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Toyotaspeed90's AFM theory is a good one, but I still say you should check for exhaust blockage first because I'm the one that thought of it. O2 sensor's just attached with two little bolts, so pretty easy to check. Actually, forget that, his theory is easier to test.
To test the AFM theory, jumper Fp and +B on the check connector. Take a look at page FI-64 and 65 in the BGB and you'll see what I'm talking about. This jumper should make the pump just run. If I understand the wiring diagram correctly, you ought to be able to start the engine with those wires jumped. Mind you, I've never tried it. Anyhow, if that "fixes" the engine dying problem, take a look at the relay and at the fuel pump switch in the air flow meter--and the wiring associated with these.
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