My C-max has developed a hesitation under acceleration - it`s definitely not a mis-fire. Put new plugs in, and a dose of injector cleaner, which has made a noticeable improvement but not cured it. It`s a 56 reg petrol 1.6 n/a, 96k miles, serviced regularly every 7.5k, and regularly returning 50+ mpg. It`s similar to the hesitation on the corsa which turned out to be both O2 sensors, but unlike the corsa, no engine light on, and nothing showing up on a diagnostic test. Oddly, it is worse when going round a roundabout briskly... made me think it could be a poor connection somewhere ? Any suggestions please ?