Use your voltometer to pull the code off the diagnostic port. Then you have an idea of what is wrong. I haven't done it myself that way but I think they show how to on vfaq. Or, find someone with a datalogger. Is the code always on or just when it runs like crap? Have you tried reseting the ecu?
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97 Viper GTS
03 Mercedes CLK500 rollin on dubs...
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