My flashing check engine light seems to be gone. I went to clean the MAF sensor two nights ago and noticed for the first time since owning the car that it was installed backwards! The airflow arrows were pointing away from the turbo's intake pipe. I cleaned the sensor with some CRC MAF cleaner, reinstalled it the correct way, and amazingly enough the car had quite a bit more pep on the commute to work the next morning. I replaced the NGK Laser Platinum plugs last night, which had about 60,000 miles on them, and those made a noticeable difference, too. Between those two changes and readjusting the throttle cable, which was really stretched, it feels like a whole new car!