engine carrys on running for one to two seconds after turn off

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from reading these write ups you lot seem the best people to ask thanks

engine over run

'91 TDX 2.8 Fourtrak.

My girl very often runs on ,some times, i can have the key out before the motor stops, but it always stops within a few seconds. Have never regarded it as a problem. Just always thought it was a quirk,which I have come across before, in electric switched/stop control agri machines,(had to take a blunt instrument to them). It does seem dependent as, to how she has been driven prior to stopping. Think it may be due to crud/or wear in the switching soliniod on the injection pump.

Edward (ews) '92 Fourtrak 2.8 TDX