I'm looking for recommendations for an indy shop in Frederick MD, where I work. I have a 2003 e39 540i/6 M-Sport and having some rough idle/ throttle by wire /MAF sensor codes that I clear, but come back on again every 500 -800 miles ( drive about 80-100 miles per day RT for commute from Chambersburg PA where I live). Let me know anyone you may recommend.

Mike Herbert