What's up guys! I have a small problem (I hope)! While at low rpm's between 1 1/2 and 2k it starts to jerk but not horribly bad. When I try to go about 25mph is when I noticed it was bad. Soon as I give it more gas it goes away. If anyone has any ideas on what could be causing this pls help! The service engine light is on and it is the o2 sensor and the knock sensor. Could one of these be causing this. I have only had the car for about three weeks and it has been doing it since I got it. Also the service engine soon light comes on for about 100 miles then it will go off for about 20 or 30 then come back on. Pls help!