Just had a DFM/DOD delete done on my truck after it spit a lifter 7k miles out of warranty. I cant get the truck to idle, unless its at 800-900 rpm. Doesn't matter how much idle torq I add, falls like a rock unless I save it. Almost got accident trying to log it. It has a btr stg 2, 210* cam stock vvt. Twice, I was able to save it with the pedal at target rpm and it would hold not for long. Just to add, the mechanic who did the work is not a tuner.
My Question is, should I tune the NN first? The truck runs great off idle. Fuel trims are 7-8%. I'm starting to think I have a mechanical issue.
Any help is much appreciated