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Have you checked your fuel pressure? Fuel pump might be faulty. Might supply enough pressure for a few mins but might start taking a nose dive. Check fuel pressure at idle, and while driving if you can.
Also, could be a bad injector o-ring. I had that issue on an old SR of mine 10 years ago. Replaced the o-ring and problem went away.
Clean the mafs out with electrical contact spray. Also try switching the MAFS for a known working one from another car.
You could have a bad ground or wiring somewhere. Check to make sure your ECU plug is all the way screwed on to the ECU. I've see that before too where it isn't and causes all kinds of issues.
Check for any leaks in the intercooler system. Leaks in the core, torn couplers, loose clamps, etc.
Check your coil pack harness. Make sure the wires aren't frayed on it, as they can do that with age and heat. I've encountered that myself as well.
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