Fitted two new lambda sensors yesterday. Had to remove the cats and replace the sensors. Car is now doing LESS mpg and runs like a bag of sh!t! Idle is fine, but driving with the revs under 2.5k rpm, it judders and feel like its misfiring. MPG is down 25. The old sensors were at least getting me 30/31!! Overall, the power is down massively. Tried flooring it and was shocked! Exhaust gasses dont smell rich or eggy. I do however, has a blow from where the cat mates with the manifold. I'm getting two new gaskets today and will fit them tomorrow. How come two new lambdas have made the car worse....alot worse! Horrible drive home last night from work. Didn't think I was going to make it home!!