There was also a workshop note for the MGV8 that two plug leads on one bank shouldn't be next to each other. I dont recall which two but a google search should produce the info.
Here: NB .. "make sure plug leads 5 and 7 don’t run next to each other (5 and 7 are adjacent in the
firing order and cross firing can occur)"
And.....NB: the cap and/or rotor arm are often responsible for various chronic running problems - always check
these first before anything else!
