Get a set of noid light tester. Drive the car until it starts misfiring again. Stop driving the car, (do not shut the car off) and disconnect the cylinder 3 injector. Plug in the noid light and see if it's responding.
Seems like you either have a short in the wiring or a faulty ECU. I'm leaning towards a short because very seldom do we have problematic ECUs.
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I like my bikes how I like my b¡tches...naked!
2014 Triumph Street Triple
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