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Discussion Starter #1 (Edited)
The dreadful Check Engine Light Came on today, no limp mode though.

Onstar says "Fuel Control System reading not as expected"

Only mods - Airaid/Green Filter. Green filter has been on for about 2 weeks / 200 miles.

93 Octane - Texaco / Chevron last fill up.

Any thoughts before I head to the dealer?

*Update* - engine light sometimes turns off, sometimes it's on. Could it possibly be the air/fuel ratio causing the light?
 

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Discussion Starter #2 (Edited)
Turned out to be a cracked pcv tube... causing vacuum loss. Car was running lean on both banks at idle.
Bye Bye $230 to the dealer
 

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Thanks for updating the post with results. Always frustrating to come across a thread with the same symptoms you're experiencing, with no updates.
 

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Thanks for updating the post with results. Always frustrating to come across a thread with the same symptoms you're experiencing, with no updates.
And then people get on your ass for not searching!!
 
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