I also have this problem. Going on a long road trip this week will have to see if it goes away after a while of driving. Funny because my 98 SS was as smooth as glass at 140mph.
2014 Black on Yellow
ZL1 Convertible 6 Speed.PREVIOUS CARS:
2010 black on black 2SS/RS Manual,1998 Black on Black T-Tops SS Manual,1997 White on White with Orange racing stripes Z-28 30th Anniversary Convertible Auto,1995 Tan on White Manual Z-28 Convertible,1993 coupe Black on Red Z-28 Auto.