Volvo Troubleshooting Questions? Ask a Mechanic for Answers ASAP
What issues are you having?
I am sorry, but since those are three separate problems for one question value, I can only go into vague detail about each.
The revving could be a dirty throttle body. There may be fault codes stored that can help the shop find the problem, but I would start by cleaning the throttle if no codes are present.
The shaking at high speeds could be a wheel balance issue or a worn suspension component. They will need to check the front end for loose parts and correct as necessary.
The vibration when braking is usually a sign of warped brake rotors.
The headlights could be a wiring issue if you have halogen bulbs. It is common for the connectors to melt and cause this. If you have bi xenon bulbs, it could be a ballast issue or bad igniters but it would be unlikely for them to both fail at the same time.
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