1992 gmc suburban has no power and bogs in cold weather

check feul lines are clear and not blocked failing that check spark plugs and leads

You need to perform an OBDII diagnostic test and look at the stored faults. Sounds like a temp sensor or Mass Airflow Sensor. Also dirty air filter needs to be changed every 40,000 miles. be sure to delete stored faults and recheck OBDII periodically for new faults.

Check the idle air control on the throttle body it is on when the engine is first started stays on until the engine is warmed up.

Check the coolant temp. sensor (It controls warm up RPM, open loop ECU mode) And change the fuel filter every 20,000 miles to prevent water in filter from freezing ( fuel starvation).

The Catalytic Converter is one possibility, but not likely. If when the truck bogs down, and stalls out, this could be more related to a fuel pump issue. If on your truck the fuel pump is located inside of the fuel tank, then once the pump heats up, this would happen. Acting as though it's something electrical, but it's really not.

SHIFTER CABLE WILL BE BROKEN SOON. CABLE IS BINDING IN IT'S SLEEVE, COLD MAKES IT HARDER TO OPERATE...

You may have been given the wrong thermostat. Either way, you can try a hotter thermostat. If the water pump has never been changed it might be time for a new one. I've already had one that was so old that the propeller inside had the fins rusted completely off and the bearings were so bad it was messing up the timing of the motor. The truck wouldn't idle. And guess where alll the rusted off propeller chunks ended up. . . that's right. In the radiator, heater core and the thermostat. I flushed that truck for three days in both directions to get all that scrap out of there. Good Luck. And if you still have the old thermostat you can always throw that one back in, just to see what happens.

http://www.obd-codes.com/p0161
This site explains in great detail each trouble code.
http://www.obd-codes.com/p0137
Here's the other one.
Like I said,this site does an excellent job of explaining what's going on with your code.

im assuming youve done basic tune up of plugs, wires, air and fuel filters, oil, distributor if applicable (im guessing not but never owned a dodge)

if it bogs down/stalls at stops only when its hot, try a new egr valve. probably getting stuck open. if not that try heavier oil to see if its losing compression, just one step up. also,

if it runs ok after clearing the computer by disconnecting the battery for a while, probably a dying sensor (most likely o2)

if after clearing computer it still runs bad after warm up, see if it bogs down really bad when letting it warm up from cold without driving (just idle to make sure its not egr system). if it dies or sounds like its close to dead, then its probably something fuel related (clogged/faulty injector, worn fuel pump, bad pump relay)

hope it helps

fuel air or spark.. dead miss one one or 2wo cylinders indicated ..check plugs /wires / injectors timing and vacuum leaks ...good luck