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First, welcome to the forums!
I'm sure other more knowledgeable people will chime in, but I am chasing down similar rich conditions. Here is where I am starting:
1. I installed an air/fuel ratio (AFR) gauge. This showed me that I was rich for the full range of operation, not just on boost or accelerating. I was getting black smoke on acceleration too.
2. I am checking my CIS fuel Pressures.
3. I also want to check my fuel pumps to make sure I am getting adequate fuel delivery.
4. Air leaks after the fuel metering plate.
5. I did also swap out the DME that controls the lamda system with a known good one, but this had no effect for me.
This is just where I am starting and like I said others will probably have better information and I'd follow their lead.
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"The reason most people give up is because they look at how far they have to go, not how far they have come." -Bruce Anderson via FB
-Marine Blue '87 930
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