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Hello, what you'll need to do is disconnect the harness from the double relays and injectors the ohm them while moving the harness around to see if the readings change. It is most likely a problem in the harness where the wires to the injectors are either not making cood contact at the plugs or the wiring is begining to deteriorate and break. I'll post the manual HERE so you can also test the double relay if the wiring proves ok.
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