when I drive my car and it gets chance to warm up generally in traffic on the way to work, it will start jolting when accelerating or even driving at a steady pace (kangaroo style)and becomes very irritating, it does this mainly in warmer weather and will not do it as much when it is cold or raining, I have had this problem now over a year and have spent about £300 on people fault finding to no avail.... any comments???