Fabricio,
Wet plugs, black smoke, gas smell=too rich, for certain.
The question is why? If your car sat for 7 years, this is not good. My guess is something in the fuel injector pump is causing the over rich condition, OR, perhaps your cold-start injector is "always on", dumping extra fuel in when you do not need it. When the engine is warm that cold-start should NOT be energized and no fuel should be coming out.
I'll have to go to the Tech Manual and see if the split linkage test be revised for better understanding.
The concept of the test is simple: at various RPM, Idle (<1000); Midrange (<2000) and High Range (3000) you separate the linkage so you have individual control over air (that is the top part) and fuel (bottom part). You run the engine at these RPM and see if the engine wants "more air"; "more fuel", or is "just right" at the various RPM's.
So, for example, push down the linkage to acheive 2,000 RPM; separate and hold the parts together. Now, add more air by leaving the bottom linkage steady and pushing down the top; this opens the air flow. The car's RPM should go down. Do the same with the lower linkage, adding more fuel; the car's RPM should go down, too, on a well-adjusted system.
If the RPM's go up with more air, you are too rich. If the RPM's go up with more fuel, you are too lean. That is the essense of the test, to determine where you are rich/lean at the full range of RPM.
Now adjusting it all is a different story. There are plenty of places to adjust everything and plenty of places to mess it up.
We know you are rich because of the smoke and wet plugs. My first guess is the cold start; second guess is something in your pump is stuck. Try testing the CSV, when the engine is somewhat warm, remove the electrical connection to the CSV. Maybe the relay is stuck on?
