Hi, im a new member. i bought a 2017 avalanche grey gt350. I drove it about 400 miles now. As of this morning, i was driving in the highway shifting from 5th to 6th gear and i have no acceleration and sluggish pressing on the gas pedal rpm doesn't want to move up its staying at 2000. Did anyone experienced this yet on your gt350. Im still on my break in period and didn't go past 4 to 5k rpm yet but this is the only time i experience this from happening. Please reply with any advice on what to do.