Hi I've recently bought a 2009 x type 2.0 sport then yesterday it started what seems to be like a misfire when I put my foot down in 1st and second then seems to fade after driving it ive been told it could be an injector ?

 

It could me many things. You need to get the codes read. Is the check engine light on.Troubleshooting by guessing can get very costly with a Jaguar. Your problem could be a bad coil, vacuum leak, plug fuel filter ETC, ETC.