Well it wasn't the oxygen sensor but my oxygen sensor was corroded and would have become a problem in the not too distant future so I'm glad I replaced it. $107 for the sensor. I think I will look at the MAFS next but I really think it might be a vacuum leak.

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1987 300SDL 167k
1992 Volvo 740 140k
1990 Volvo 740 250k
1989 Volvo 240 269k

Anyone want to trade an old Volvo for an '87 300sdl?