Sounds like a MAF or a vacuum leak, google the code to see what it says. then after you do that, report back with the info and we may be able to advise you on how to diagnose the problem. But we need need to know the essentials, Year Make Model, mileage, mods? recent maintenance? We've got no clue if you're in the wrong forum or if you have a 4 or 6 cyl E36 or if you drive a Ferrari.