92 with idle problem (sometimes) then smooths out

[Zoom45]

My 92 240SX convertible with automatic is all stock. It runs great but sometimes when I pull up to a stop sign it will miss like a plug wire is off but it has all new ignition parts and runs great soon as you touch the gas. It seems to do it soon as I come to a stop. It will do the miss for 10-15 seconds then smooth out to normal. It's like the motor may have excess fuel to purge out of the cylinder before it will idle correctly. It seems to do it worse with cooler weather. I can't find any vacuum lines off or disconnected switches. Any ideas of what can be causing this?
Thanks,
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[Riedell]

It can be a list of multiple situations but mostly can be dealing with is your Idle Air Control Valve, possibly your Air Regulator.

If you have not done so yet, take your IACV off and give it a nice cleaning or just shoot carburetor cleaner in to the vacuum hose. I wouldn't advise doing it. In my perspective, I would just take the whole unit off and give it a nice clean.

Try checking your air regulator too. If you pinch the hose connecting to and the idle drops, your air regulator will need to be replaced. If idle doesnt change, then it means it should be okay.

[Zoom45]

I found the number 1 fuel injector must not be working. With it running the engine doesn't change when I disconnect the wire from it. It seems like a cylinder misfire when I unplug the other injectors.

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