Car shakes and jerks

Sounds like you're having a problem in the engine electronics so the engine is not firing properly and is missing or running very rough. This isn't going to "go away" and needs to be fixed. Go to a better mechanic.

change your coil :)

My car just started do the same as you described, did ever found what was wrong with the car? Thanks,

The 2002 Hyundai Elantra we are trying to fix is having the same type of problems. The only thing that I can add is that the car refuses to hold a charge on the battery. We have replaced the battery and the alternator but the problem continues. Should we then look at the voltage regulator or maybe the computer. The other problem we have noticed is that after a jump and while leaving the jumper cables on the car seems to work fine, but once we remove the jumper cable and the car warms up it begins to misfire so bad that it looks like the engine is going to jump out from under the hood, the then will not start on it's own and the misfiring continues until it quits running.

When a car shakes and dies out at stop lights could it be the catalytic converter