Two problems related to gas recirculation valve (egr valve) have been reported for the 2001 Chevrolet Blazer. The most recently reported issues are listed below.
The contact stated the check engine light came and the engine started missing. The air reflector on the bottom of the throttle bottle plate disintegrated; the air reflector has gone through the motor. The plate was embedded in the pistons, broke two spark plugs, and bent push rods. He changed the spark plugs. He then pulled the vehicle in and realized the push rods and lifters were bad. He contacted the dealer they offered no free remedy.
The pcv valve was replaced and adjusted four times but it still rattles.