The last 2-3 times I've been out in the Passat, it has been fine for about 10-15 minutes, and then once it is warm it developes abit of a judder, where it feels very sloppy and looses power. I've also noticed a nasty smell, which I think is the CAT.
Could the CAT be the problem once the engine is warm? I've also thought about lambda sensor but wasn't sure if that would be intermittent.
Any help would be much appreciated.
