I know my cars not exactly a G40, but I could do with some help.
If I am driving along at a steady speed, engine around 3000 rpm, the tacho will suddenly start flicking up to 6 and 7 thousand revs and the car will start to splutter. However if I put my foot down ever so slightly, or let off ever so slightly, it will stop. Its clearly ignition related because the tacho is spazzing out, but its strange how its only at certain loads. It revs clean if you are accelerating hard.
Any ideas?