Jerking when taking off
 

I have a 2002 chevy silverado 4x2 with 93k miles which has been jerking in a way only when I take off or when the automatic transmission is suppose to go to the next gear. I had noticed it sometime ago but it has become very noticeable and was wondering if anyone has any idea what the problem is. I changed where I purchase gas and had the transmission fluid changed and flushed at 60k, any advice??

Sounds like it is misfiring.