Ive just changed that, for some reason it was ballsing up allsorts, it was running very rich, so down on power, idling very rough and the dial needle was all over the place. Must have been a small air leak, but I couldnt find it? Ended up Ting it from the brake booster nipple and all is fine now and faster than I ever remember I also swapped all the jubilee clips for Mikalors, which also made a big difference