Hi I have a 207cc 1.6 Vti 2007, the engine seems to have two distinct noises, one is a high pitched whistle when revving, perhaps an air leak, the other is a fairly loud deeper pitched whine when revving. The timing chain has recently been replaced. The throttle seems to rev up more than you ask it to briefly and i have also had it stall occasionally and stutter from time to time. Lastly, particularly when cold the idle can be erratic, fluctuating a little which goes mostly once warm. Any help appreciated.