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Q:

solution to why my car stalls on the freeway at 70 mph. on 1998 Jaguar XJ8

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
replaced fuel pressure regulator and filter
(2) Answers
Sounds like your computer needs to be reprogrammed. This should
have been done by the dealer under a recall they issued.