2009 Malibu L4
Customer added a cold air intake.
After missfire on cylinder 4, DTC came.
When you drive the car DTC missfire code goes off, comes back when sitting at idle at a light. Also if you raise the idle to around 800+ missfires vanish.
Do a compression check, leak down, all within 120's psi.
Customer takes car to dealer, dealer says this is common and the only thing needs to be done is raise the idle to about 800-850rpm as the cold air intake messes with the cam actuator.
Dealer would not touch do to aftermarket CAI.
Sounds like the MAF tables need to be retuned?
Any thoughts on this or experience?