I have a 2007 SS 2.4L, my check engine light came on so I had it scanned at the dealership and it came up with a code for misfire on cylinder #1...so they cleared it and told me it may have been a fluke but that I needed to come back if it came on again....well it did, same code was pulled and they wound up replacing all four injectors with "updated injectors". Apparently there's a flaw in the design of the stock 2.4L injectors...has anyone else heard of this problem?

 

Yeah i posted a TSB for it in the 2.4 section a couple of weeks ago

 

My cobalt SS 2.4L is in the shop right now with the same issue. Under warranty luckily but sucks i'm without it...