Vehicle Shudder problems of the 2008 Chevrolet Aveo

My car started to shake, squeak, and jerk. This has been ongoing for a few days now, after taking it to two different mechanics. I then learned about the safety recalls for the wheel barring, drive train, and pulley system for the engine. I called my dealership where I purchased the used car and was told they couldnt help me with recalls. I then called gm directly and was told there was no open recall on my car. I further researched and found that to be a lie, your data base alone states there is one that may cause the car to catch fire. This is my first car to purchase and with it having major safety recalls and no one wanting to help, I didnt know who else to contact.

About 300 hundred miles ago now 2008 chevy Aveo lt with 1740 miles as of now and still driving. My wife and I feeling a vibrations on the car every time we stop at the traffic light. When car shift to drive it vibrate a whole lots for passenger to notice and I took the car twice to dealer and they said the car is fine with reading from computer. I took it second time and they check the motor mounts and transmission mounts ( visual inspections I think) but they said everything is fine but even the service manager says its normal for vibrations but not so when I was sitting in the back seat where I could still feel the vibrations. I like to know if the is a lemon or a defective part or what? please let me know what you think and who to contact? I was told to come at the dealer on August 4, 2008 because a gm tech person was coming to answer questions concerning cars. Manager and tech from gm did not show up so im left with a vibrations on the car that im paying unhappily. Please help. Have a nice day carmen.