The failed FPR caused the engine to run very rich, fouling all the spark plugs. Fortunately, it seems to have failed rapidly (as opposed to progressively) so it doesn't seem to have run long enough in this condition do damage the engine. The catalytic converters had already been cut out.
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UPDATE: The ECT had also failed, causing the EEC to think the engine was at -40 degrees, contributing to the rich condition. Fortunately, the engine didn't run well enough long enough for the extra fuel to damage the bearings or rings.

Owner caption December 2019 · Photo 18 of 121