Few months ago a part of the lobe on my cam broke off in my 16 Silverado L83 so decided to upgrade a few things while I was in there. I did a DOD delete with a stage 1 cam with a 0 degree phaser lockout from TSP and upgraded the valve train (lifters, pushrods, and valve springs). I am new to tuning and still learning so sent the ECU off for a basic tune. Got everything put back together and truck started up no problem. However I did have a P0011 code. I asked around on some forums and was told to just disable the code due to the phaser lockout. Was that correct? Also having issues with the truck stumbling at low rpms or even dying when coming to a stop. Seems to be the worst right after starting, when it?s cold outside, and seems to die a lot more when in reverse. Not sure what all was done when I sent the ECU off. Just wondering where I should start looking or any ideas of what it might be?