In this Monday, Jan. 28, 2013, file photo, cars move along an assembly line at the General Motors Fairfax plant in Kansas City, Kan.
Credit:	Orlin Wagner/AP

In this Monday, Jan. 28, 2013, file photo, cars move along an assembly line at the General Motors Fairfax plant in Kansas City, Kan.
Credit: Orlin Wagner/AP

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GM extends shutdown at three plants due to chip shortage

The computer chip shortage is taking a bigger bite out of General Motors' production plans than the company originally expected.