computer says fuel rich very rich?

can you tell me the code? or is it a bank sensor code or MAF sensor code?

this can happen when the fuel injector gets stuck or the fuel pressure regulator goes bad and allows raw fuel into the intake manifold, here is the location of the regulator so you can check it out and I have included this guide to help explain the black smoke as well.

https://www.2carpros.com/articles/engine-black-smoke

I would replace the spider injector because they and problem with those as well. The fuel pressure regulator is where the fuel injector assembly is located.