one thing to check is the ground connections for the injectors. unbolt them and put it back together.
At starter speed an old fashioned analog multimeter can show you the needle wagging on connections at the trigger points and injectors. A modern digital meter would need to be on a dwell setting to get the same effect.
Follow the trouble shooting workflow in the book and you should be able to narrow it down to a specific faulty circuit and maybe a specific component.
-CTH
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