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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2 answers
Hello ,, sounds like pro tech hit it on the nail ,, clean that throtttle body
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.