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could also be that with all that soot, the catalytic convertor(s) are now plugged
we had the convertors cut off, and the gas is not bad. Its either not burning the fuel in there, or dumping too much, and this problem existed before the opti spark was replaced, but it was drove so long, its just gotten soooooo much worse
so am i reading this right in post 12.......if you cross A and B it will count out flashes through the service engine light, and if you cross A and H it will come across the speedo? So there are 2 different ways for the year 1993?