1994 toyota 4x4 constant acceleration problem & engine power loss?

I have a '94 toyota 4 cyl. manual transmission. The accelerator seems to open up once the engine warms up. when I stop at a light or sign the truck revs up and down constantly. I went to the auto part store and was told that the idle gauge/valve might be the problem. Is this correct? Also, there is a... show more I have a '94 toyota 4 cyl. manual transmission. The accelerator seems to open up once the engine warms up. when I stop at a light or sign the truck revs up and down constantly. I went to the auto part store and was told that the idle gauge/valve might be the problem. Is this correct? Also, there is a problem with the engine loosing power while going up a slight hill. I don't know what this could be. Head gaskets? Engine trouble? Please advise.
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