I have been getting repeated engine light codes which equate to misfires in cylinders 1,3,5 and 7 on my 2000 Disco II.

Does the fact that the codes all relate to the odd-numbered cylinders narrow down the likely cause to anything particular??

Do these codes necessarily mean an ignition (electrical) issue or could it relate to air/fuel flow problems on that side of the engine?

Any ideas might be helpful as I try and track this down without spending a fortune.