I put a bunch of miles on my 1.4T this weekend on Labor Day vacation. But I have noticed at take off from a dead stop it chugs a little bit, almost like the front end is vibrating. Kinda like if I took the traction control off and just mashed it, the front end kinda goes loose. I only have like 1500 miles on my Eco and it is bothering me that I go to take off and I can feel it in the front end.
How hot was it outside? If it was hot, then try 91 octane, the issue will likely go away and you'll like the performance and gas mileage you get better. The additional cost for premium gas is at least offset by the improvement in mpg.