THE CAR IS SUPPOSED TO IDLE LIKE THAT UNTIL IT WARMS UP MY 89 LUDE DID IT AND NOW MY 99 DOES IT bUT ONCE THE THERMASTAT OPENS UP IT IDLES NORMALLY I BELIEVE IF YOU HAD A PROBLEM IT WOULD ALWAYS IDLE LIKE THAT NOT JUST WHEN IT COLD I LIVED IN MINNESOTA WHEN I HAD MY 89 AND IT ALWAYS IDLED LIKE THAT UNTIL IT WARMED UP IT ESPECIALLY DID THIS IN THE WINTER TIME