25 hp mariner 1990 new gas new correct plugs starts ok.but when i open up it cuts off as if gas was disconected it will get me home in fwd just off idle at snail pace if i throttle up does'nt make it to plane a second or two and it fall s off rpms then i twist throttle to neutral to save from stalling it does'nt sputter just cuts out .fuel line bulb has gas pumped up no leaks from tank or engine connections it ran like this last year only time used with different gas &plugs happens right away, hot or cold ,water pump ok .two years ago firt time it happened ran all afternoon on idle speed took home changed to new plugs ran fine till took out yesterday with new stuff must have been coincidence that plugg change caused temporary fix because it didn't work this time sometimes motor is used couple hours a year .