Just finished a cam install in a '12 ZL1. Mild cam with very little overlap. Runs great with the initial tune I have put in it but it goes into PE after sitting at idle for about 10-20 secs. AFR drops into the 12's then bounces back into 16s before coming back to 14.68 afr. Any ideas why it does this. Never happened before the cam install. Below is the scan and tune and config. See at 3:19 the event. Cam is 227/246 on 120 LS What other info would help?