I am not sure what a plug defouler is. The nature of the fouling would indicate the nature of the fault to some extent and provide a clue as to what action is needed.
You say the coil and wires are new but you didn't say you had renewed the plug, checked the spark power, distributor cap if it has one or any of the other tasks usually done as part of the fault-finding process.
If faults are still active the management will be on the emergency programme and it must be expected the engine wouldn't run as well as normal.
Maybe if feels like the CAT is blocked because the CAT is blocked - it is far from unknown.
SOURCE: co2 censor
The Oxygen sensor is located on top of the catalitic converter which is as viewed from under the van between the firewall and the Moter/tranny. It's got a wire coming off it going into the harness. The shop charged me an hours labor to change it out and probley only took 5 minutes.....
SOURCE: 2005 avalanche code po300 changed plugs &
did you have have AV little idling for while if you had i'll set code too and bad gas.Is run fine?let me know
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