If I am driving on a flat surface initially it will be fine but once I accelerate up a hill it shudders or bucks almost like it isn't getting enough gas. If I put on the cruise control, the problem seems to disappear. After driving a bit, the problem is present even when idling at say a light. I have taken it to numerous mechanics as well as to the volvo dealership. The dealership said it MIGHT BE a new electrical harness $1400. I responded that $1400 for a might be was a little harsh. Any thoughts or similar experiences out there?