Hello all - I have a 2007 Volvo XC70 with 170,000.miles I live at an elevation of approximately 5,000 ft I notice every time I drive off the mountain to lower elevations the car drives fine, when I come back into higher elevations the car drives very rough, especially on steeper inclines. Any ideas what this issue could be related to? Thanks for any imput. unfortunately the closest dealer is over two hours away.

 

the MAP sensor is effectively an altimeter. That's the part I'd suspect is failing.

 

Thank you, can that be accomplished by a local mechanic or do I need to visit the dealer?

 

its an easy repair. Hardest job for the DIYer is finding the MAP sensor :-) then its plug and play