The heat range is more important than the type. Im not usre what the DSMs run stock but I run a heat range of 7 in my Acura as compared to a range of 9 stock. This may be getting alittle over my head as I am not too familiar with the DSMs. I would just go over the ignition system with a fine toothed comb and do somethng to get those fuel pressures down.
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