Report "My car is running a little rough when warmed up and I'm creeping along accellerating from 0 mph to 10 mph (like in a parking lot). By "rough" what I mean is there is a slight feeling of vibration I can feel through the steering wheel. My mechanic adjusted the engine timing and that did not fix the problem. He said he thinks maybe something is slipping inside the automatic transmission, or maybe it's a problem with the engine mounts. But I have since noticed that my fuel economy has decreased. I take mostly short trips and in the winter I used to get about 21 mpg in the winter, and now I'm getting about 17 mpg. Could a transmission problem or problems with engine mounts cause decreased fuel economy, or is something else perhaps causing the problems? By the way, it shifts through the gears without any problem. Thank you very much in advance"