97 jimmy no power over 1500rpm

Rangerx52

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SO all was normal.

changed my water pump last month, ran great.

Was on my way home from work, went up a hill. Got to a stop light, and noticed a tiny bit of white smoke from the hood, and smelled hot oil. Nowhere to pull over, so i drove the 2 blocks to a parking lot. Fluid levels good, but some smoke from the oil dipstick tube. a little smoke from somewhere outside the tube aswell.

On the way to the lot, the truck had no power, and bogged down. temp was a little high, but not overly. needle barely moved.

Symptoms now:
-Starts and idles fine.
-drives fine for a few minutes. after that, rpms will stop at 1500 rpm, and bog down. no power, and rpms will not increase above this (maybe 50-100 sporadically) Pedal to the floor, rpms wont climb.

Things i've done:
-checked pcv valve. rattles, but moves freely.
-disconnected MAF connector. Vehicle dies if unplugged while idling. Started up unplugged, the engine WILL rev over 1500, but there is no appreciable power above 15-1700.
-my cat has been rattling for some time, months. didnt touch it, but made note.


Anyone have any ideas?
 
Didnt check exhaust odor.

pulled the O2 sensor this morning on a hunch, and strapped it aside leaving the port open.

Truck howls like a monster and runs a little cruddy as expected, but i got almost all of my power back. Looks like a plugged catalytic converter.
 


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