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Question edited for clarity and all the typos.
Question moved to a better category than 'Garden'.
Surging is normally caused by an air leak. Check from the air filter all the way to the inlet manifold on the cylinder head. When you engage the blades the motor is under 'load'.
More information here, but says, 'not enough fuel or too much air'.
The carburetor has two circuits, a main power circuit and an idle circuit. When the idle circuit gets partially clogged, the governor will drop the throttle shut, the engine partially dies and the governor yanks the throttle back open till the main kicks in. If the idle circuit gets completely clogged, the engine will need the choke partially on to make up for the missing air fuel mixture, will run rich and surge horribly. The carburetor needs to be cleaned out, a can of Berryman's spray can dissolve the crud out and restore operation. 90% of this problem is caused by old contaminated gas
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