idling problem on 1992 Nissan 300ZX

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
car will start, idle for 10 seconds, then choke down. must increase rpms in order to stay running. originally car was at traffic light and quit. cranks easily.
(1) Answer
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It's so difficult to guess without being able to experience the problem first hand and at least do some basic diagnostic tests. A coolant temperature switch (at the very front of the engine on top) could have failed or have dirty electrical connections causing the computer in your car to think the coolant temp. is cold and it will then decide to richen up the fuel mixture. A vacuum leak from the air ducting or failing air flow meter can cause this problem. A leaking injector or failed fuel pressure regulator can cause this problem as well. One thing for sure if neglected and the engine is allowed to run rich the catalytic converters may become damaged. Coolant temp sensor and fuel pressure regulator are the two more likely causes but tests need to be done first before condemning parts.