So, my car idles a little roughly, not too bad, but I really would
like to smooth it out. It's got 99,100 miles on it (98.5 A4Q 2.8 for
those who didn't read the Subject header), and I put in a quart of a
valve and injector cleaner recommended by my independent shop recently
(went through a tank and a half of gas on it, as recommended), but the
idle isn't much better. Am I doomed, or do I need to lather, rinse,
repeat with this stuff, at $30 per quart?