Sorry, but you have to give us more info. Have you changed plugs lately? Wires, cap, rotor? Dont mess with the idle adjust until you've tuned er up. Any vacuum leaks? How does your intake look? Fuel filter?
Perhaps supply us with some history on this car... How long has it been doing this? Did it start doing this suddenly or was it a slow degredation? Has this car been sitting around, unstarted for a long duration or have you been driving it frequently? How does the car run when it's not idling? Have you performed any routine maintenace or tune ups?
The more we know the easier it will be for us to help. Good luck.
i think its the air bypass valve. Only in proper operation when its cold. Made my supra and a mate's cressida run like dogs when they were cold. This was on a 5me, though im pretty sure a 5mge has it too?