Have you tested ignition timing yet? If the injectors are bad, starter fluid should have started the car for at least a couple of seconds. If it backfires out of the intake, its usually caused by bad ignition timing, i.e. the distributor isn't installed correctly, or the firing order is wrong.
A timing light will work even if the engine won't run.
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'88 Supra Targa 5 speed w/ '90 7M-GTE 
Currently Running Good  
For Sale: Light blue body parts, Blue interior parts all from '90 supra targa turbo manual.
Also for sale: R154 trans, brake pedal, master cylinder, booster, abs actuator, sensors, abs ecu, driveshaft, 3.90 lsd rear end, radiator, wiring, speedo cable, 8 saw blade wheels, '88 ecu, relays, cruise control actuator (bad cable), empty fuel tank, etc....
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