Thank you all for welcoming me!
So I spent countless hours, late nights, and weekends trying to diagnose the rough idle problem after I replaced the head and timing chain on my new old Cobalt. I'm happy to announce that she's running pretty well now! After spending a few hundred bucks on new ignition coils and control modules (Yes, more than one of each.), it turned out I was using platinum spark plugs instead of iridium plugs!
So a note for those of you out there whose delicate Cobalts may be experiencing random misfires or rough idling: check your spark plugs! For my 2.2L 2006 Cobalt LT, they were the "ACDelco Professional Iridium" spark plugs (part number 41-105). Apparently, these engines are very picky and sensitive to spark.
Welcome to the forums! Hopefully you can get her running perfectly again. How many miles is on her? Any plans for her after you get her back to 100%?
Dustin, she'll hit 120,000 miles in the next few days; maybe this weekend. She's at 119,9XX right now. So my plans right now are to continue replacing things that should have been replaced before or at 120,000 miles. Any suggestions?
Beyond that, I plan on cleaning her up (new upholstery) and eventually handing her over to my 12 year old son who helped me bring her back to life. We've been learning on this thing together and it's been really awesome. I'm sure he'll never forget this experience. I know I won't.
That, oooooor he could buy my brand new set that I'm still trying to get rid of
Welcome to the forums, btw!
Yes, part of cleaning her up will be cleaning up or replacing headlights. What you got, Parthros? I might be interested.
Thanks again, everyone!