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Rough Idle and Check Engine Light Due to Sruck Open EGR Valve on GMC Sonoma

Problem Description and Possible Solution

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.

Problem Data
RepairPal Verified
Average mileage: 177,000 (149,000–205,000)
2 model years affected: 1994, 1995
4 people reported this problem
Viewing 1 - 2 of 2 comments
Missing bad. We cleaned it once and this fixed it for about a month but it started back again and I'm sure I will have to replace it.
Rough Idle. Have to have distributor checked. The carbon issue is alway and issue. I even got a gasket from napa that had screen in it and it is still causing this issue. Please contact me if someone has a real fix. rfnut2001@yahoo