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  1. Alden

    [SOLVED] Rough idle, stuttering cold start, p0300

    Hey guys, just got an account here, however I was a member of the mazdaspeedforums for many years. I’m looking for some help on figuring out some possible causes of my problems. a little background, car is a 2012 speed3, basic bolt on. Full turbo back with high flow cat, Sri/tip, intercooler...
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