88 accord low idle upon cold start

88 accord DX, M/T, 221k, carb. great engine rough starts. i observe the plate when it starts cold and it seem that the plate doesn't open up fast enough (i open it fully with my finger and all the shaking stops). the engine shakes, while it seemed to be burning rich (gray-light black smoke coming out tail pipe); especially cold days. It idles opposite of what it should be when starting cold - i have to give it some gas to keep it warm up and it idles high (can go up between 2k-3k rmp) when it half-way warm. a tap on the accel. pedal brings it down to normal idle

It idles fine after warmed up. an auto part person told me its running rich, is that right?!