Lherring81

I am Looking at a 2007 Tahoe that has had the afm delete and lifters replaced with non afm lifters. It has 191,000 miles. It is s 5.3. It drives excellent. But it idles funny. It has a slight vibration in its idle the geeks kinda rough. I have been told it is normal after the afm delete. Also, I noticed yesterday after idling for a while it had a ticking noise. I turned it off and couldn't replicate that noise.

Anyone have any experiences with this??