The first thing to check is the wheel lug nut torque just to be on the safe side. The most common cause of vibration on acceleration is the inner CV joints. When the CV joints have play or looseness, it can vibrate on acceleration. If the CV joints are ok, have the front suspension checked for any loose or worn ball joints or tie rod ends. If the front suspension is tight, it's possible your tires are the cause, especially if they are cheap tires. I recommend bringing it back to the place you bought it and have a mechanic go for a ride with you so you can point out the problem, if they are reputable they will most likely fix it for you. Hope this helps.