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Year/Make/Model: 2008 Mazdaspeed 3 Mileage: 150,000 on body, ~60,000 on engine Location: Maryland Concern: Black/blue smoke out of exhaust when accelerating from idle or after deceleration DTC's: none Modifications: CPE Catless DP, Corksport catback, Autotech HPFP, Stock diameter intake, CPE...

Hello all, I have been having a problem where the car stumbles a little when idling. The biggest problem is that it is intermittent. Most of the time (when the problem does occur) it idles poorly for a couple of seconds and then smooths out. Very rarely the car will stutter slightly under...