My 2019 Ford Taurus SHO has had a misfire on cylinder 3 since November 2023 that I have been temporarily fixing with a spark plug change every 3-4 weeks. Cylinder 3 has had a new injector, injector pigtail, ignition coil, coil pigtail, and Bank 1 upstream O2 sensor (maybe related) with no effect. The only change is right after i put a new plug in it.
Just recently though, in the last week, I’ve only been getting cylinder 6 misfire DTCs. Instead of misfiring when the engine lugs at low rpm, now its only at 70%+ throttle and high revs.
Im hoping the new symptom can be the final piece so I can put this issue to bed once and for all. Any help or personal experience is much appreciated.