I have a 2007 Suburban, it surges when at idle sometimes, and “Service Stabilatrak” and “Traction Control Off” message showing. The check engine light is NOT on. Searching the internet gives a few reasons that it could be but some are costly and was hoping to get some advice before having to spend a lot, I’m leaning toward throttle body. Anybody ever have this issue? If so what did you do?

 

Full range scan of all 4 code families is step ONE. That's what every shop does, anything else is just throwing darts and wasting money on unneeded parts.
A full range scan tool is needed to even attempt to fix anything that's warning light or message related in today's vehicles.