my ca has a shudder or bucking at various times during operation. on 2002 Volvo V70 XC

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?

Asked by for the 2002 Volvo V70 XC
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Do you have any check engine codes. It may be an exhaust flow issue such as the cat. converter fouling or a fuel/air mix problem. Need codes posted if you have any.