Evinrude 150 problem

[Nitroman]

Have a Evinrude 150. Took boat out yesterday, ran fine until the last hour of the tournament day (75 degrees). It then started missing and running rough especially at idle. Took boat out again today and again boat ran fine (strong) until about 1:00 pm (80+ degrees). Started running rough, missing and starving for fuel (soft bulb, not collapsed). Had to idle (cough and sputter) to boat ramp, engine would take no throttle, it would die. Starts up fine although rough. Would a new bulb, fuel line, and set of plugs help or should I be looking at another issue. Any help is appreciated.

[boats.net]

That would be a start, could fix your problem if the spark plugs are fouled. If this is a computer controlled model you can have the computer diagnosed.