Is the smell like rotten eggs by any chance?
If so, then your cats may be breaking up or melting. That would create a big restriction in the exhaust making the engine seem sluggish when in fact a lot of the power is being used to push the exhaust through the cats.
The root cause may still be your FPR, as too much unburned fuel causes your cats to break down quicker.
Does this make sense?
Good luck,
Rich D.
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