I have asked this question a few times before Can

I have asked this question a few times before Can steering while car is stationary in drive cause any sort of damage to a car. I was messing around with my car one day and turned the steering all the way left and all the way right about 15-20 times. The steering wheel felt slightly tight to one side so I thought maybe there might be some air in the power steering pump, and I thought that would help get the air out. But since I did this, the car seems to be running rough. When I let off the accelerator the car does not coast and seems to lose speed rapidly. And just recently it has started to occassionally sputter on acceleration. When I accelerate for the first time I will hear a light thunk near where the cas pedal is but it wont do it again after that. Now the car seems like it takes about 2 seconds to go into gear from park. Could this wheel turning thing damaged a joint which in turn has started damaging my transmission? Would what I did be consiedered abuse to the vehicle, and void my warranty? Don't people steer stationary all the time, like when parellel parking and getting out of tight spaces? My car is a 2009 CRV. If anyone has any kind of information or advice they could give me, I would greatly appreciate it. I have taken the car to the dealer and they claim nothing is wrong but I think they are just ignoring these problems cause they don't want to fix it under warrantly These problems have greatly frustrated me, and I am afraid I did something to mess up my brand new car. If anyone has any advice or input I would greatly appreciate it.