Mechanics

CHEVROLET OPTRA RPM PROBLEM

2004 Chevrolet Optra • 140,000 miles

When my car is on and the rpms are low, when I am stopped at a light or it is in park, it chugs. Its like a bouncing motion, and this only happened after oil was added a few days ago. Also the check engin light turned on at the same point.
Any ideas on what this might be?
Thanks!
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January 21, 2013.



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