The A-6G Intruder was to have been a less expensive alternative to the A-6F, which
had been cancelled in 1988. It had most of the A-6Fs improvements but not the General Electric F404-GE-400D turbofans.
The third A-6F (BuNo 162185) was kept flying to in support of the A-6G, but no production was undertaken.
Sources:
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Grumman Aircraft Since 1920, Rene J. Francillon, Naval Institute Press, 1989
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American Combat Planes, 3rd Edition, Ray Wagner, Doubleday, 1982.
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United States Navy Aircraft Since 1911, GordonSwanborough and Peter M. Bowers, Naval Institute Press, 1990.
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Grumman A-6 Intruder and Ea-6 Prowler, Robert F. Dorr, World AirPower Journal, Vol. 12, 1993.
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Grumman A-6 Intruder, Robert F. Dorr, Osprey Air Combat, 1987.