Vectra jumps when braking and struggles with gear changes

Holden Holden Advice Holden Vectra Holden Vectra Advice Holden Vectra 2006
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Every time I brake my 2006 Holden Vectra CD seems to jump, and when I go to accelerate it struggles to change gear causing the car to pull when accelerating. I thought it was the transmission at first but it seems to be something else. Could you please help?

It sounds like it's not running as it should, and is perhaps in need of a tune-up.

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