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2000 Ficht 150hp missing running low RPM
Rev 2000-3000rpm the tachometer drops to zero split seconds and pops back up normal with sound of engine miss firing. Bogs down with lack of power above 2500 rpm. Added new fuel, changed fuel filters after sitting approx 3 years. Pulled plugs all six and found all plugs are burning rich with black oil all electrodes and tip. Checked intake fuel and left side has oil sitting on bottom metal. My thoughts is boat sitting for 3 years, requires new plugs, moisture removal called HEAT sic for gas tank, decarb with sea foam and run it to burn off the old oil/gas in lines...?
When the motor miss, tach goes to zero and restarts back to original rpm. The diagnostic lights like when turning ignition off and on with beep does not occur leads me to believe not a faulty ignition problem.
BTW EMM was sent out to Marine Computer (Eric in Alabama fixed NO start problem was savings ~$400 and timely versus DFI.
Motor starts up fine every time and engine is not smoking. Any and all suggestions appreciated as I am new to this site. Thank you and fish on.