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To save yourself hassle, I'd do two things.
First, don't use platinum plugs, use copper. NGK BPR7ES are the most popular recommendation.
Second, put the stock chips back in. I'm sure you can pass with the aftermarket ones, but you're more likely to pass with the stock ones.
Sounds like you're running rich, so there are a lot o potential culprits for that(02 sensor, AFM, chips, etc), but I'd probably do the above two first and retest.
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Stock 1988 951, TT aero wipers
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