Engine Troubleshooting

I have a 1990 Toyota Supra non turbo, the car runs great except that it will not idle, everytime you let the car come to idle it will die, I can drive for hours with no issue just it will not idle. Both the battery and the alternator have been replaced in the past 3 months, just not sure what it could be.
Any help in troubleshooting this issue would be greatly appreciated.

Probably need a new idle air controller. If it's not that then I'm not sure but it's probably because there's not enough air getting into the engine.