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    Unsustainable WOT

    1993 MCM 4.3LX with 600hrs. Accelerates well to WOT (4000 RPM), but only for 30 seconds. Engine rapidly decelerates, "pop-pop-popping" as it comes down off plane (overly lean?). Retarding throttle will catch idle RPMs. Engine will accelerate again, and decelerate again. Timing has been...
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