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your injectors get their 12v from the asd relay and the computer controls their - side. the asd relay also powers the coil, so if you have spark but no juice to the injectors then you are looking for a broken wire to the injector rail. all of the injectors get their juice from that one source.
The 5.0 tuned port engine has two sets of injectors - all injectors are powered by the pink-black wires from two 10amp injector fuses. They get ground signals on the green and blue wires from the computer. You can use a low voltage test light to check for injector pulse.
tune up-read your plugs and then check your timing. use timing light and double check with scan tool-most 91 305's were high outputs which
requires higher octane than regular (fuel grade revelatnt to compression ratio and altitude) you may want to check fuel pressure could be a clogged filter or bad pump.
did you put the platinum plugs back in.get a noid light test the injector wires make sure they are working . when you hook noid light up these should have a steady blink .if light dont blink just light up.you got pcm problems .if you get no lights you have open wire.besure to check ignition coils that control those misfiring cylinders.
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