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.

RepairPal Verified
Average mileage: 112,000 (112,000–112,000)
3 model years affected: 1992, 1993, 1994
4 people reported this problem
1 person shared problem details
When idling, revs to 1000 then drops and almost dies.
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My blazer runs good for a bit but then its like the engine revs up and down slightly and seems...
how do we get this from sticking. it usually only does this when we change elevation.
Can you remove the EGR valve and the truck still run good

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