newbie here.

Hi im new to this site. Owned Landy,s for years, but this is my first TD5 Disco, bought it 2 weeks ago. Changed all the oils, and filter + centrifugal, didnt touch the fuel filter, now it spins over for ages, and seems to fire on 1 cylinder at a time. What could i have done? it started fine before i changed the oil. Thanks

Check for oil in the ecu plug and change the injector loom is as good as any place to start.