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The Brazilian replacement coils are famous for unreliability. There are some threads on this. But the original black Bosch coils were filled with asphalt type material - as a heat soak. It melts under normal operating temps, hence any air bubbles trapped in the filling of the coil body, disperse themselves to the top. Which is why that coil is mounted 'upsidedown'.
The Brazilian (and most others probably) are filled with epoxy. So any bubbles are trapped. Then you get hotspots in those windings and finally the coil starts to break down.
If the coil is not an original black Bosch, heat soak is something to consider.
Alan
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83 SC, 82 930 (track) - Stock except for RarlyL8 race headers, RarlyL8 Zork, K27-7006, 22/28 T bars, 007 Fuel head, short 3&4 gears, NGK AFR, Greddy EBC (on the slippery slope), Wevo engine mounts, ERP rear camber adjust and mono balls, Tarret front monoball camber adjust, Elgin cams, 38mm ported heads, 964 IC. 380rwhp @ 0.8bar Apart from above, bone stock:-)
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