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Q: rough idle when cold and will stall when put in drive on 1990 Nissan Pathfinder

if my ac is running the idle is worse, i replaced plugs recently w/o good gap tool,
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Basics should be inspected for rough Idle. Proper Base Idle speed adjustment should be performed. Further inspection of Throttle body for carbon build up on throttle blade will cause a low Idle condition. Engine should be inspected for vacuum leaks. Ignition system should be inspected . Fuel pressure should be inspected for proper fuel pressure and volume. Your local repair shop should perform a full diagnostic and also inspect computer control system for trouble codes.
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