I have a 1991 Mazda Miata and I can't get her to start. She'll crank but wont catch (she sounds like she right there but just wont turn over). At first the electric drivin fuel pump wouldn't go so I replaced it, now the new feul pump will run, but only when I run a live wire through the circuit(bypassing the computer). And when I do that, she still won't start. I tested the air intake with another that I know works so I know its not that, and when I spray starter down the air intake she starts to run then sputters out. So I know I'm getting spark and air but the fuel I'm not sure I'm getting, if not from the fuel pump then from the injectors, I neighbor of mine who owns a miata says that if it were a problem with the injectors directly, only one wouldnt be working. I whiched out the relay for the injectors and that wasn't it. I figure something in the cars computer is not letting the fuel pump or the injectors run, but I'm not sure how to test that let alone how to fix it. Does anyone have and idea what my next step should be?

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test with known good computer, its under the passenger footwell carpet. i have a known good one from my car (upgraded to Megasquirt) if you find thats the problem.