So last night , one of the first frigid nights I started driving with my new protune. I noticed a few things.

Car pulls extremely hard and builds boost extremely fast.

However, in 4th gear I noticed on the highway at WOT, the boost would jump from 10psi to 20psi and back down, and repeat. It would just bounce back up and down. So I reset my ECU and the problem started to go away.

Any ideas?