A function key is a key on a computer or terminal keyboard which can be programmed so as to cause an operating system command interpreter or application program to perform certain actions, a form of soft key. On some keyboards/computers, function keys may have default actions, accessible on power-on.
Surge definition, a strong, wavelike, forward movement, rush, or sweep: the onward surge of an angry mob. See more.
The Engine Surges Engine surging can best be described as the condition where the engine RPM fluctuates repeatedly from high to low during operation. More often than not, this type of problem will be caused by a dirty fuel system or intermittent ignition spark. Here are some general guidelines that may help in the troubleshooting process: Engine Surges at ALL Speed Ranges