# 1997 Jaguar XJ6 running rough

**URL:** <https://community.cartalk.com/t/1997-jaguar-xj6-running-rough/123786>\
**Category:** Maintenance/Repairs\
**Tags:** jaguar, xj6\
**Created:** [August 27, 2018, 5:19am UTC](https://community.cartalk.com/t/1997-jaguar-xj6-running-rough/123786 "2018-08-27T05:19:25Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![Sloan](https://avatars.discourse-cdn.com/v4/letter/s/eb8c5e/32.png) [@Sloan](https://community.cartalk.com/u/Sloan)\
**Post date:** [August 27, 2018, 5:19am UTC](https://community.cartalk.com/t/1997-jaguar-xj6-running-rough/123786/1 "2018-08-27T05:19:25Z")

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6 cylinder 4 liter motor runs rough while it is warming up after I start it. When it warms up it seems to smooth out. Fuel filter changed; fuel conditioner/cleaner used; new plugs; no trouble codes come up. What is the problem?

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**Author:** ![db4690](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/db4690/32/2583_2.png) [@db4690](https://community.cartalk.com/u/db4690)\
**Post date:** [August 28, 2018, 2:32am UTC](https://community.cartalk.com/t/1997-jaguar-xj6-running-rough/123786/2 "2018-08-28T02:32:51Z")

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Some kind of a vacuum leak, which is worst when cold, then partially seals as the motor is warming up . . .

That is one possibility, but I have to say I’m not familiar with this engine