Thanks gents. I have about 2k more miles to go before I change the oil. Since I use nothing but Synthetic and the little 3 liter holds 8 quarts, I may wait and run the Fuel Injector cleaner just prior to the oil change. I am so darn nervous about any additives to the engine because of the Nikasil block issues from the model year that I own. I was searching around the site (previously) regarding my rough idle. I saw plenty of posts that included the ICV (which I did not replace), the two O2 sensors (replaced) but very little / nothing about the Mass Airflow Sensor. Although an expensive part (over $300 for OEM, did not want a refurb), the rough idle really cleaned up. Due to this rough idle, I want to now make sure the injectors are in top notch condition ....