I have a 2004 90h.p. 2 cycle johnson ouyboard,the motor runs fine over 1500 rpms,but it will only idle if i squeeze the primer bulb every 1 to 2 minutes apart.I have installed a new omc primer bulb,checked fuelline connections,tried a different portable fuel tank and is still doing same thing.It will idle for up to 2 mins. before it dies or I squeeze bulb.does anyone have any suggestions?I know it is something simple.