A defective exhaust gas recirculation (EGR) switching valve may cause an intermittent rough or unstable idle engine.Google+
Car Problem Reports
Hyundai XG350 Rough Idle Due to Faulty EGR Switching Valve
Hyundai XG350 Problem
Engine Affected: 3.5L V6
Average Mileage: 92,157 mi (65,000 mi - 189,000 mi)
Visitor, 2002 Hyundai XG350, 3.5L V6, 189,000 mi
I need to know where the egr valve is located on the the car.
Visitor, 2002 Hyundai XG350, 3.5L V6, 85,000 mi
Rough idle but ok if I put it in neutral. Haven't fixed it yet.
Visitor, 2005 Hyundai XG350, 3.5L V6
when car is in park the car vibrates and the rpm guage wont go down passed 2 on the gauge car vibrates until car is turned off
Not fixed yet, but same problem occurs intermittently
Visitor, 2005 Hyundai XG350, 3.5L V6, 76,100 mi
rough idle. has not been fixed. diagnosed as possible egr swich issue. dealer that sold me the car is supposed to be repairing it and also all required maintenance. I am waiting 3 weeks