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

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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?
(2) Answers
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.
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