It could be as simple as a vacuum leak but without knowing what year, make, model and engine it is hard to tell you what it may be.
Engine surging is usually due to insufficient fuel supply. Probable causes could be an air leak in the fuel system, or possibly a dirty fuel filter, causing fuel restriction.
It could be as simple as a vacuum leak but without knowing what year, make, model and engine it is hard to tell you what it may be.
maf sensor
Governor hunting or surging is a problem that causes the engine to constantly speed up rapidly and then slow down rapidly.
The most common cause of engine surging (rev up and down) is a dirty air filter.
bad battery. it gives off the rest of its power when its about dead. and that's what causes surging
Most common cause of surging is a dirty/clogged air filter.
A 1994 Cadillac Deville that has an engine surging problem and is stalling out can indicate it is not getting enough fuel. The fuel filter may be clogged.
According to " Outdoor Power Equipment By Jay Webster",Governor hunting or surging is a problem that causes the engine to constantly speed up rapidly and then slow down rapidly.
Surging is often fixed by replacing the fuel filter. A simple job and most small engine shops will have the part.
That only usually only happens in a manual transmission
Separation of the ethanol due to water in the gasoline.