A number of maladies

[Oriskany]

So I've had my 3.0 2005 X type Sovereign auto (130,000 miles) for a couple of weeks now and the only work that I have had done is to have the steering aligned and the wheels swapped front to back as one of the fronts was wearing unevenly. Recently a few "effects" have started and I wondered whether owners of older, high mileage X types live with them or whether they are serious. Firstly, my car makes an audible whine on acceleration and this increases in frequency with speed but goes quiet on overrun. Secondly, sometimes I get a misfire-type juddering and hesitency on acceleration at quite low speeds but no engine light etc. I am aware that my car is old and I don't expect perfection but it is comfortable and the heated seats, sat nav and Alpine stereo make driving a pleasure in it.