Sad Cars and Lumpy Petrol

Last week we went down to a car showroom "just to sit in a new car". The current car is now of the opinion that we don't care about it any more (actually we do, the new versions of my car are almost - but not quite - as nice as the one I have) and so today the car engine went all lumpy on the way to work. Normally in my car you try to go faster and nothing much happens. Today if you tried to go faster it slowed down.

I hope it was due to dampness, and not my unfaithfulness with an '05 reg.