whey iam i loosing power on accelaration and its show egine falut.

Sounds like you have an Mannifold intake air leak. Take a look at http://www.2carpros.com/questions/jaguar-x-type-2004-jaguar-x-type-imt-valve Also, take a look at http://forum.roadfly.com/threads/12667740-my-x-type-projects-and-mods/page4 (Towards the bottom, quote 75)

accelaration and its show egine falut