2007 S80 3.2 A/T issue
 

Hi guys,
Thanks in advance for taking time to read this. Im from South Africa (should this make a difference to the model:) i want to put you in the loop to where and what has been done, in short the car jerks like riding a horse when idling and very low speeds, once you start increasing rpm the jerking reduces. Some history on the vehicle, i have redone the motor on 166k km due to waterpipe that burst and engine overheated. Since the redo i have again replaced spark plugs all round. The vehicle was at a Volvo dealership in SA and they simply chose the easy way by saying engine needs replacing again... never the less another workshop suggested mountings which i believe wont cause this (please correct if it could be) or crankshaft sensor perhaps? The engine management light sometimes goes on but now stays on with reduced power. My question is what may be the issue? Hopefully one of you has been successful with a similar issue. Cheers and thanks agian forums like this are awesome and very helpful!