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  1. H

    Gas in Oil, Running Rough

    My 2001 MIE 350 MAG MPI is running rough and blowing lots of light brown/white (not blue) smoke... like uncombusted fuel. I have since replaced the fuel pressure regulator, one ECT sensor, and the Ignition sensor. I switched the MAP, IAC, and TP sensors with other engine. Also note...
  2. H

    2001 350 Mecruiser Horizon Running Rich and Rough Idle

    I have twin 2001 350 Mercruiser MPI Horizons (SN 0L399054/56). These have the upgraded fully closed cooling system due to water ingestion problems pursuit was having in the 2000-2001 models (recall). I have had the boat for two years and have solved multiple issues looking at posts from other...
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