Sneaks

Oops, sorry guys! Here's a picture of the engine (sorry for any bad quality, was taken on an iPhone) :

Hello NPORA members, I have an interesting issue. I have an 87 Nissan 300zx with an 87 Pathfinder engine in it. I bought the car from someone who evidently thought this would be a good idea. It starts up and runs, but with some issues. 1. It runs fuel-rich 2. At start-up when cold, it idles extremely rough and sometimes dies, which I then have to start it back up just by turning the key 3. Once it hits optimal running temp, it idles at 900-1000 RPM, and is extremely smooth. But before that it runs rough enough to pose as an issue. 4. Check engine light is on, not sure if that's from their tampering with and attempt at installing their own security system into it, or if the engine just has issues. I've read in the 300zx manual that we have that there is a Fast Idle Control Device (FICD) on the 300zx engine, but I'm unable to find one on/for the Pathfinder engine. Maybe it has a different name? Sorry for the vague post, but I'm not really sure where to go with this car. Any help is GREATLY appreciated so I don't end up scrapping the car. Thanks!