Hello v40 driver, drive a volvo v40 bj. 98 with a 1.8i. He now has 223000 km. Now I have the problem that he often has speed problems, that is that in idle and coupling the speed goes up to 4000 high, then fluctuates and after a few seconds goes down again to 1000. When I drive and gas give, and then go away from the gas, he passes for a while independently gas. The workshop has no idea What it is and have made oil change and air quantity knives I am in despair, thank you in advance for the help. LG, Erik Ps: bearing damage has excluded workshop