fuel system
 

1993 969 wagon- My check engine light is on and Volvo says something is wrong in my fuel system but they do not know what. When I am driving it will start out okay but then when I get up to about 30-35 it feels like I loose a little power and it studders but still continues driving. I have 218,000 miles on the car. Thanks for any advice. The dealer wants to check out the whole system.