Rough Idle and Check Engine Light Due to Sruck Open EGR Valve on Chevrolet S10 Blazer

4.3L V6 multi-port FI only
The exhaust gas recirculation valve (EGR) may stick open causing a rough idle and the Check Engine Light to illuminate. Our technicians tell us that a piece of carbon may become stuck in the valve causing this problem. Cleaning the valve will usually correct this condition, in some rare cases the valve will need to be replaced.

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Average mileage: 152,318 (112,000–192,636)
3 model years affected: 1992, 1993, 1994
6 people reported this problem
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problem details
1992 Chevrolet S10 Blazer 112,000 mi,
When idling, revs to 1000 then drops and almost dies.