hey, got a '95 ranger 2.3L 2wd, and it idles rough but only when cold on a winter day. once it warms up it's smooth. by rough idle I mean that the idle speed seems to surge up and down a little bit. sounds funny but if I step on the gas it's gone till it returns to idle. this is only the case when the engine's cold, like I said.

 

its normal for a cold engine to run at a higher rpm for a bit until it reaches normal operating temperature.