And I am going in for new glasses in about 2 weeks, maybe it will help.
As for his issue, might be an idea to go mist the wires in the dark with the engine running shake them with a stick and see if there is any arking to the block.
If it were the wires I would suggest he call his supplier and see about getting them replaced under warranty.

 

If you take a spray bottle full of water you can mist things individually with the engine running and see what/were/when it acts up.
So start with the #1 spark plug, soak it good, does it mis?
On to #2, and so on.
Then move on to the coil pack, soak it, soak it good, what happens?
Use a old Windex bottle or your sons squirt gun, not his double barrel Super Soaker, but the one from the Dollar Store.

 

Thanks guys, I will try these suggestions.

 

Took my truck to my mechanic, He replaced my front 02 sensors. Rough idol is gone, and no more codes or CHECK ENGINE LIGHT. BUT.......Why is there allways a BUT with these trucks ?.........He found a small coolant leak at the rear of my engine, while installing a new E-brake cable. He said he thinks its the head gasket.

I will be leaving Sunday for vacation, when I get back, I guess I will find out how good or bad my extended warranty (3 year/36,000) is that was purchased when I bought my disco a couple of months ago. I may break the insurance company before my warranty runs out!

GODSDOZER

 

Let us know how that warranty works out for you.