My son has a 2006 90 hp Optimax. It ran fine last fall, winter and spring. It would troll for hours without a problem. All of a sudden it will start and die in about 30 seconds. If you rev it up right after starting it will run fine revved up but will die when slowed down. He purchased a manual and checked the fuel pressures. Low pressure 33#, High pressure key on engine not running 30#, High pressure engine running 108#, Air pressure 95#. The pressure was tested with a flushing attachment and a clean new fuel source. Thank you for any help you can give. Engine SN 1B362014
