I cant figure out why this is happening. Car in question is a Vauxhall C20LET I know you may say what the hell you doing on here but its a common known thing that you ford guys know your stuff. ANYWAY!!!!

I thought i had a dodgey coil but i changed it for another one and its doing the same

Symptoms are - slight rough idle and misfire

Reason - Spark arcing from king lead onto the terminals of the coil. You can see and hear it plain as day jumping from one to the other.

Now the car is running off the power of its own battery just now due to myself waiting on correct alt bracket but i have had it idling from jump leads.

Parts new are, Leads, Rotor arm, dizzy, plugs (gapped correctly) just had a full engine rebuild and still waiting to run the dam thing in.

Also checked to see if earth was dodgey so i got a jump lead and connected it to the battery GND and the other to chassis - No joy

I changed the king lead for another one - Still no joy...

Video of how its revving is here - http://www.youtube.com/watch?v=7RYPmUbg_bk

Now we all know it takes the easiest way to earth.... i can think where the resistance is coming from.

Any ideas guys?? im a patient man but im slowly losing it with this thing!!!