1990 Chevrolet SSR

1990 Chevy SSR V8 Two Wheel Drive Automatic 38850 miles

I have a 1990 chevy sport V8 350. It has been garaged and been sitting for a couple of years. My check engine light comes on periodically when I drive over 45mph for five to ten minutes and when I slow to a stop it turns off. Do you have any idea what could be causing this?
December 8, 2009.

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