Hey Dan,
My Blk.xfire Coupe Is A 2004,automatic, Only One Month Old With About A Thousand Miles On It. I Bought It New At A Dealer In December 04.
I Put That Little Bottle Of Injector Cleaner That The Dealer Gave Me In The Tank And Filled It Up With Chevron 86 Octane And It The Engine Stumbled Once At A Red Light During A 30 Minute Cruse.
This Car Is New, I'm Going To Go Back To The Dealer Tomorrow And ***** 'bout It.