Do you recon that stuff really works, Steve? Reading around most say that if the situation is injector related and is bad enough to cause a misfire and/or raise a warning code, a tank-added cleaner won't be aggressive enough to do much good. Its not all that expensive, but is it just throwing money away?
I guess the fact that you mentioned it means you think otherwise (!), but have you ever noticed any difference afterwards? I tried it once (Wynn's), and didn't.
David