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The most common cause of that is a bad EGR Valve.
Engine overheating will cause the anti-freeze to surge into the overflow tank. A blown head gasket will also cause the anti-freeze to surge into the overflow tank.
Rotors are out of round,need to have them turned.
The price of pineapples in Hawaii is less likely to cause an engine to hunt or surge.
my sparkplugs are gaped to wide can that cause my car to surge and poor starting
trottle control module
the engine to stall and surge at idle
You probably have a dirty carburetor causing that surge.
EGR VALVE IS LOCATED NEXT TO THE TOP RADIATOR HOSE AT THE ENGINE, IT CAN CAUSE ENGINE TO MISS, STALL AND SURGE.
Check your vacuum lines this usually the cause for a surge in engine speed when idling or running.
gas pedal cable?, fuel pump?
engine torque and small brakes