My car was fine until it started making a noise in motor. I was at work and when I got a off work and started driving home, the engine lite came on and it wouldn't shift, and it would jump high rpms, and it would only go in third gear, and then it wouldn't go at all .
Not sure how many miles you've put on your Avenger, or what kind of driving you regularly do, but it sounds like you're having a problem with your transmission. It could be as simple as just needing to add transmission fluid, or it could be as dramatic as a failed transmission. I would suggest you take your car to a technician as soon as possible for a repair.
For additional assistance, please find an AskPatty Certified Repair Shop at http://www.askpatty.com/search/?type=all&m=30&q=&keyword= and they can help you diagnose and repair the problem.