Algodoo

Spider11 - You need to be specific and detailed about what you are asking. When you simply say "I need help" it's like walking into a doctor's office and saying, "I'm sick, help me". The doctor will look at you with a puzzled look on his/her face, and then start to ask you detailed questions about your illness. If you are looking for someone to show you how to design a complete spring engine car, I doubt that it will happen. There are many other spring engines on Algobox, and you just need to do some searching to find many good examples of them. If you have just a specific question about the spring engine, such as how long should the spring be, or how much tension should it have, etc., then someone may chime in and give you some suggestions. Again, BE SPECIFIC.

Xray if you had opened the file it would've been obvious.
Click on the box below the small circle, put that on other collision level.

Smartass - I did open the file, but no it was not obvious. It might be obvious to you because you are the one who made the scene.

Okay, so I clicked on the box below the small circle and I changed the collision level. The engine didn't shake as badly. I think you have conflicting collisions between the different geometries. When two geometries that have the same collision levels are touching each other, they become very unstable. That might be what's happening here. I'm no expert with spring engines, and so hopefully someone else will chime in and give you some assistance.