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So my daughters 99 DOHC throws misfire codes, mostly happens at higher speeds. I've done the plugs, wires, cam sensor, crank sensor, coil, did a major PM a year and a half ago, took the intake off, had the injectors rehabed (Injector Rehab.com nice job with before and after charts), fuel rail looked clean, rinsed and blown out. What's left? PCM?