I need a diagram of the firing order for spark plug coil, landrover discovery 2002

most properly your electronic coil thats faulty. on you tube there is a video how to test with a 12volt lamp tester your coil

i am suggesting you a link from where you will get the the diagrame http://toolsnyou.com/

i need to brush up on landrovers

what year is yours
SU carbys or EFI system

spark plugs means fuel ....not a diesel
leads and coil and electronic distributor fitted

a bang when started ? that a backfire through the air filter ?
timing out or fuel issue

you say running rich running rough
the 02 sensors may need replacing
clean maf and air filter
timing chain or belt slipped ?

starting if a separate problem
starter relay or starter and solenoid to be checked out

The COIL PACK TOWERS are numbered : coil----3---4 pack---2---6 plug----1---5 ----------------------------------------------------------------- The engine cylinders / spark plugs are numbered : passenger side , front to rear , 1 , 2 , 3 -----drivers side , front to rear , 4 , 5 , 6 ------------------------------------------------------------------- The spark plug firing order is ( 1 -4 - 2 - 5 - 3 - 6 )

autozone

FROM LEFT TO RIGHT, 5/2 3/6 4/1. ASSUMING YOU HAVE THE 3.1L ENGINE.

Firing order is 1-8-4-3-6-5-7-2 Cylinder numbers looking at engine from front Left Bank 1-3-5-7 Right bank 2-4-6-8 Distributor has clockwide rotation,

http://www.landrover.ee/est/files/manuals/engine/v8-46e.pdf

18436572 just like a chevy...1357 cylinders on drivers side ...2468 on passenger

This is your best choice.Here is a diagram attached.