engine miss SS

Have any of the Cobalt SS owners had this issue?

08 HHR SS
long story short dealer put new injectors in and still has issue with a miss fire on Cylinder #3, P0303. Now the GM Techline is saying a valve must be hanging on #3 causing a the missfire. This only occurs at start up after it has sat for 8 to 12 hours in sub 30 deg weather, but at start up the temp has been anywhere from 15 to 35 deg. So any how I find it really hard to believe that a sticky valve is causing an issue only at start up. no issues any other time. I am just a little nervious for the dealer to put a new head on this. I am concerned I will now have more issues with the items they have to remove to get to it for instance intake leaks, Turbo issues...... Has anyone else had or heard of this? thanks

If you don't like what the dealer's diagnosis is your only option is to go dealer shopping. this is still warranty right? If not warranty, and you don't agree, shop around.

There is a service bulletin for this issue....misfire when cold due to compression loss from sticky valves caused by fuel contamination. As a dealer its only smart to address this known tsb first. Sounds like there doing a good job. fuel contamination is why they replaced the injectors first...probably failed the active fuel injection test.

yep still warranty work only have 24k miles. Do you have the TSB? I would really like to understand this one a little more. I will be keeping this car for a long time and not interested in fighting a poor repair now. thanks