You should check the fuel pressure first. You may have a bad fuel pump relay(s). Your fuel pressure with key on engine off should be around 43psi. With engine running, it will drop to around 38psi at idle.
Also, disconnect the air flow meter(if your 90 has one) to see if it will start and run. If it does, the air flow meter could be dirty, or bad. Do the same with the TPS.
Pull a plug wire and see if it is firing while you crank, too.
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