I have a Monte Carlo that has a bad smell in the engine, I'm having a hard time starting it sometimes, and the car is worse on gas than usual. I went through a full tank of gas in a week not driving much at all.
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have a coolant pressure test done. Have the radiator cores checked for blockage. Sometimes when an engine has sat for a period of time, rust and scale form in the water jackets of the engine. ON running ,this breaks away and blocks the cores of the radiator Other times the old motor tolerates a partially blocked radiator when a relative new motor needs all the cores free to maintain the temperature.
The PO441 has to do with your HO2S 2 (Oxygen sensor). You need to check to make sure the wire is not off of the sensor and check the grounds to the Oxygen sensor. Could be a bad Oxygen Sensor. The other code has to do with your Evap system Purge solenoid circuit. Has to do with detecting an improper voltage level. Could be a shorted Purge solenoid.
Check firing order 1,3,5 in the back next to firewall 2,4,6 in front check coil packs. If o.k you could have burnt valves. As for the knocking If its a heavy kock and it happens all the time even at idle it could be the main bearings on the crankshaft.
there is a coil pack for spark plug wires that could be arking to the engine(which you can see at night very well) or one of the sensors have gone bad , test the night visual of the coil pack after testing for spark at the spark plugs. so first you need to know if you have spark ,if you do then it may be one of the timming sensors