Originally Posted by Richard Gallant

@Sandman614 Yea my one O2 reacts "normally" the other is weird, I graph them as I drive. The one side the peaks are all over the place.

I did discover my air filter has got some black tar like substance on it that was not there last month so likely no helping, a new one is on the way.

To be fair the Disco goes when I put my foot in it and runs smooth under power so it might just be me, my wife says I am a tad OCD about maintenance.