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Honestly that sounds like plugs to me...on my old Jeep and my waverunners a few good WOT runs usually cleared up similar conditions, but ultimately the plugs were fouled and that was it. The job's so easy you might as well try it. Can't hurt!
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2007 E92 335i - Retired
2011 E92 6MT 335is - JB4, Stett CP, Synapse BOV, Wagner FMIC, BMS OCC, CDV mod, AFE DCI, Cyba Scoops, BMS Clutch Stop, P3Cars v2.1 vent gauge, LED side markers.
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