hello, have the following problem: With my Volvo the engine is jerking, like small flammable shutters. it then pulls off shortly before three thousand turns. with me, however, it is in gas operation and in gasoline operation. my car is a volvo v70 with a day 300. the car has 228tkm and the gas system about 78tkm. where is it best to start looking for the error? many thanks in advance greeting carpeflexus