If your in the south
Mike @ Rentech is your man
Went there yesterday with a mk1 172 that I thought was running 'alright' a little rough maybe but not to serious.
But bugger me senseless, I got it back and its a new car. I think Mike had a magic wand tucked away in his toolbox. The car is so different, pulls so strongly its like a whole new car.
Mike I think I love u! ;P