2009 Hyundai Genesis 3.8 Questions

All 2009 Hyundai Genesis 3.8 Questions

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Driving a 2009 Hyundai Genesis 3.8 Liter with 200K on the motor. Was told by my dealership that the valve seals are worn on my vehicle. If they are worn out, would they affect the compression on a cylinder leak test a...
My car seems to shudder or hesitate from time to time, mostly at higher speeds. Dealer checked transmission and throttle computer settings and found nothing wrong. Feels like brakes are engaging for a split second a...