Electrical wiz's - please help

[Datt]

My 3.9L 93 Disco has delveloped a miss, which seems to effect either one, or more than one cylinder sporadically. I've pulled the spark plugs out and noticed no. 7 to be affected and doesn't appear to be firing. So, I tidied it up a bit and swapped it for no. 3 and went for a test drive.

Still missing sporadically so I pull over in the darkness beside the road to make sure I put the lead back on correctly. This is when I notice faint blue light coming from the spark plug lead for no. 7 and the coil lead.

Am I wrong to assume that the leads are shorting out, therefore the sporadic miss is from failure for the electrical pulse to make it the plug, or could there be something more sinister.

Thanks in advance.

Matt.

[Blknight.aus]

nope thats it insulation failure of the plug lead, new plugs, new leads (dont for get the one one the coil) and you should be apples)

[mcrover]

Ditto to BK

[Dunnie]

Any funny ignition faults, wait until it goes dark and have a look for flashes and sparks. It is easier to see the problem area then.

[camel_landy]

Yep... New set of HT leads required.

I've found that the Rover V8 is very fussy about the quality of HT leads too.

M