1998 Dodge Neon

I own a 1998 Dodge Neon with 104,000 miles. It's been having a lot of troubles lately. I just had the head gasket, water pump, and radiator fixed and the car ran good for about a week. Now when I start the car the check engine light flashes and the car shakes violently. What's wrong with it now?
December 30, 2006.

IT is so bad that raw fuel is entering the converter and damaging it. Don't drive it. Get it back to the shop that did the work and let them see if it is related to their work.