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Q: idling problem on 1992 Nissan 300ZX

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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.
No car image 94a1663db56199c5353592009e34aaa51078a2469bed068bb8d6f0ba43accf97
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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.
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