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Must be Vee motors. On a port-injection inline four , checking for a clogged injector is as simple as unbolting the entire fuel rail and cranking the car to see which injector doesn't spray.
Granted, some of the wiring is needlessly complex, but with newer systems putting the ECU in the engine bay, it's becoming less of a hassle.
Still need a hell of a lot of patience (and schematics) to wire up a custom job. More than most of us (including me) will ever have.
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