One problem related to gas recirculation valve (egr valve) has been reported for the 1999 Chevrolet Malibu. The most recently reported issues are listed below.
I have had my rotors reground numerous times over the past one and a half years as well as have had both bearings replaced in the front. I had all valves replaced on the coolant system and it continues to leak still. There is a strong oder that comes in through the airconditioning vents. There is also a strong vibration when braking or traveling at higher speeds which makes the vehicle difficult to control.