Yes, I had already changed it after I had triggered another code prior to this one. And before that I changed the MAF sensor after I had trigger that code. After each replacement the car ran better but not quite right. WHile I've been doing that I've replaced the air intake and the flame trap coupling as well as several vacuum elbows and some of the vacuum lines. I think I need to do the oil separator befor I give up and take it to the dealer. Curiously, after each time i remove and replace a vacuum line it runs much better for a day or so and then feels like its running lean. Then I'll pull a line, put it back on and it will run ok for a day. It's a 93 850 with 115,000 miles on it.