2004 Chevy Aveo A/C or Transmission?

I want to apologize for my lateness and to Thank You! For helping me with my first question on July 4th.

From my prior question that was answered. I received my car last week Saturday after it was broken for the second time (timing belt).

I noticed by the 4th day, that my car is experiencing jerks, our lurches when the car is idle and/or driving. I have an appointment on Monday for a mechanic to look at it but it's bugging me and I want to get some prior information now before Monday.

In addition to the jerks and lurches - this is also going on when the air conditioner is on but yet, it disappears when I turn off the a/c.

I am at a lost as to rather this problem is a/c related and/or if this is a transmission problem?

Please advise.

Thank you kindly.

Follow up answer

No, check engine light is coming and no I haven't had a tune up. However, I did have my spark plugs/spark plug wires replaced on 04-11-08 by the Chevy dealer. During that time my check engine was on and there was jerks when I put the car was in reverse or acceleration.