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Q:

back fire on 1994 Jaguar XJS

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
backfire at low rpm ,also will not rev from an idle,sputters and backfires. changed fuel pump,filter,mass air.
(2) Answers
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Crank shaft position senor failure on that model can do this as well but proper tests for vacuum leaks and looking at key sensor values on an oscilloscope may show what the true problem is.
I would have the catalytic converter inspected for a possible restriction. Also check for any vacuum leaks or an air leak somewhere.