1983 Toyota Tercel Revs up and down at idle

I managed to get an 83 toyota tercel 5 door, and I am stumped by a problem we uncovered. At first the idle was set high and untill the engine would warm up unless you kept down on the gas it would idle for a few and die. Once the engine heated up it would idle high, but stay there. We re-ajusted the idle according to the factory but now on start it revs up and down and I am stumped. Im not incredibly inclined with this kind of mechanical genius, and the few friends I have that have any inclination are stuck. Soo im just kinda asking for someone to point me in a direction to start looking, because there is no smokeing and all the vacum lines look brand new.