my car is a BF series factory gas (gas only) the probelm is rough idling once over 1000 rpm goes fine.

need more information, does it idle rough all the time hot or cold, on first start up, or will, start and run rough then after a minute it come's good on it's own. Or it runs rough all the time and when you open the throttle a small amount it comes good. Does it run good on the highway, and what is the fuel economy like. IT could be as simple as the guts falling out of the pvc valve in the cam cover.