I bought a 2014 Tahoe PPV a few months ago. Lifter on cylinder 1 went likely due to AFM. I decided to go with an AFM delete kit. Also decided to go with a tuner instead of reprogramming the ECU. Bought a 40410 Bully Dog tuner. I spent an hour with a Bully Dog tech (after initial SD card issues) and set up the program correctly. Engine idles low (580 rpm range), and it "stutters" through the low RPM range up until around 2,000 rpm. After 2,000 rpm it runs strong. It doesn't matter if I'm cruising at 25 mph or 70 mph the engine still stutters in 1,000-2,000 rpm range. Anyone have any previous experience with this issue? I've reached out to Bully Dog, and have uninstalled and reinstalled updated software already to no avail.