Last month my 1998 V70 wagon began to shudder through the steering wheel. The speed at which this happens is inconsistent - I can be going slow, medium or fast. It doesn't happen all the time but when it does there appears to be a stuttering noise out of the engine. This is more than an annoyance when I am traveling on the highway - I have three small children and am beginning to fear driving the car. The Volvo dealer seems to feel that without a "check engine" light it will be hard to diagnose. The car goes in on May 28 - anybody have any ideas?