When I turn the key off the motor slowly runs for a few seconds sputters and then shuts off.I relaced the o2 sensor last year,fuel pumps last year and just did the spark plugs. The last time it did this i relaced the fuel pumps and it quit.The motor is 1999 225hp Vmax0x66. The original fuel pumps lasted 6 years and these are only a year old,hhmmm.
I adjusted the Throttle position sensor also,this gives me fits because I go by the book on doing it and it may be the problem also.