An outboard surging condition is usually due to fuel starvation. The fuel tank, hose / connectors, primer bulb, and or filter(s) are all suspect, and should be checked. Also possible, carburetors and fuel pump.
Engine surging is usually due to a fuel restriction. Troubleshooting starts at the fuel tank pick-up tube, and all connections, check valves, and components all the way to, and including, the carburetors.
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An outboard motor may surge due to several factors, including fuel delivery issues, such as clogged filters or a failing fuel pump, which can disrupt the flow of gasoline to the engine. Air leaks in the fuel lines or improper carburetor adjustments can also lead to inconsistent fuel-air mixtures, causing the engine to surge. Additionally, issues with the ignition system, such as faulty spark plugs or ignition coils, can result in irregular firing and surging during operation. Regular maintenance and inspections can help identify and resolve these issues.
#1 power surge
The storms surge
Low pressure also contributes to the storm surge.
Check your vacuum lines this usually the cause for a surge in engine speed when idling or running.
a vacuum leak.
You may have a pull on your batt, or a surge.
It is possible it is one of the speed sensors.
Probaby a sensor.
Rotors are out of round,need to have them turned.