just recently having a hard time starting in the morning, if it starts then rough idle for 30-60 seconds, Checked with analyzer and no codes on all tests just "PASSED". Any assistance would be appreciated.

 

pull off egr and idle air control valve and clean them thoroughly.

 

use parts cleaner, or carb cleaner, or brake cleaner and toothbrush, small wire brush. you want to get all the carbon and chunks out of them.

 

That worked, Thanks for the assistance.

 

Hi eatbread8,

Welcome to the Chevy Forums.

Today's cars have much more dependable ignition components than in the past, but the weak link seems to be the spark plugs. Whatever GM brags for your plug life, cut it in half.

For instance, "100,000 Mile Iridiums"? Yeah. Change them at 50K.

 

After all, the "Mass Air Flow Sensor" was bad!, $140 replacement. Thanks for the help have not had any other issues starting.