2003 disco, newb looking for some help!

[Disco Mike]

Rover only paper filter, after market filters are junk and don't even fit correctly.
Call Paul Grant for a replacement air filter lids.

 

[ColorofKris]

Yesterday I installed a new drive shaft, and the spacers for the cross member. Today i turned on the rover and it started shaking and the engine light was flashing, I'm on my way to work (not driving) so i don't have a chance to further look into it. Any where i should start looking? Spark plugs? Motor mounts? Is this a common accuring issue that done one could pin point for me?