Have a problem with the pickup on my xedos 9 miller, I get better pickup when accelerator pedal is half way down, If I floor it then it stutters through the rev range, like its holding back. Having it half way is alot smoother through the rev range. Car has 92k and is fully serviced up! Idles perfectly, never thrown a management light either!

Any ideas, because this is the second one I have driven with the same problem?