Just figured I'd give the forum a shot at figuring out my issue. I've got a 2005 4.8l silverado. The truck was completely stock 50k origional miles on it. I decided I wanted to go with a single turbo. I purchased a Huron speed kit with a precision 75/74 turbo, waste gate, and blow off valve. For fueling I put a walbro 450/hotwire kit, and deca 60lb injectors. 2 bar map and I am not running speed density. Using hp tuners for tuning. I had a company in Texas do the tuning remotely. The issue i am having is once it's warmed up it wants to randomly go rich for a couple of seconds and just bounces around. When I start driving it runs great but wants to randomly go rich between 2k-2.5k rpm. Runs perfectly fine at idle and through rpm range until it's warm. Anyone have any ideas?

 

It could be a number of issues.
I'd like to see the tune and a datalog of the issue.