My thought is: One of the individual coil packs has failed.... so, if that is indeed the case, you will see two cylinders on the same coil pack misfiring. (power balance test won't show much of an rpm drop on those cylinders.) Unfortunately, I don't think you can replace the individual coil packs, gotta replace the entire module...... See what happens there I guess.

Just out of idle curiosity, what spark plugs do you have in the engine? How old??

 

Spark plugs are new as of march. They are OE plugs. The sticker in the engine compartment called for a certain kind. That's what I put in. Plugs looked good. Mechanic said they look new!

 

So much for that thought.

 

Process of elimination!

 

Upon further inspection, my mechanic failed to see the burnt spark plug wire sitting on the headers! Looking for one spark plug wire now!

 

Just replace them all. I have no clue where you would get one plug wire. (aside from out in the garage.... where there are a fair few old ones layin' about.)

 

The wires were replaced a few years ago with top quality wires. They weren't cheap! I'm broke right now. I had to buy a set of 8 and 2 single wires. So I will call the Napa and order one more!

Truck still run n like crap! But, not half as bad as it was! Amazing no code thrown for a cooked wire? It actually wasn't too bad. Can't find another so far. So I black taped it and rerouted the wire. My wire hold down broke off. That's why the wire ended up on the header.

 

I had a plug wire that was burnt in half, which gave me a dead cylinder. It didn't fire at all........ and it never set a code...... CEL never blinked for misfire. I don't think the V-10 programming is as good at detecting them as the V-8's is. The V-10 just runs so smooth..... even WITH a dead cylinder.

 

Mine hasn't ran smooth in quite a while. Still has good compression, even with the 214000 miles on it. No horsepower what so ever! Still a mystery? I bought a new IAC today. Haven't had a chance to replace it yet.

 

IAC isn't going to have anything to do with lack of power.