:dunno take engine over 4000 rpm engine light flash for 10 seconds end starts to run on 7 cylinders until you restart then runs on 8 cyl until you rev it up again.????
You've probably got a catalytic converter clogging up. I bet if you pulled the fault codes, you'd have misfire, with cylinder cutout, on several sensors. If its the cylinders on one bank, chances are it's a cat for that bank.
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