While driving nomally, the throttle will start acting very eratic reving up and down aprox. 800 to 1200 rpm. If you stop and turn off the ignition, it will then reset itself and drive normally for a couple months. I have had it to my dealership on numerous ocasion, and am told everytime, there is no other epia in north america experiencing this type of problem. They say they cannot get a code unless the car is having the problem at that specific time, and have not been able to duplicate it. Ihave explained to general motors the importance of reliability of our car due to health problems, but I am told that's why I have roadside assistance.
This is a great car when it is running properly, but not very reliable.
Unfortunately, I also own a 2004 Chevrolet Epica LT. Your comments are a carbon copy of what I have experienced with this vehicle. Don't worry, you are not the only one! I think this car should be recalled and taken off of the market.
It's really too bad, because the general esthetic's of the car is great!
Not very happy with my Epica, every month it is in the shop for numerous problems. Will not buy a Chev again.