Old post but relevant subject, relevant because this is exactly what I am going through. Want to hear the tail of tears and woe? Thought so: So the 70 was running smoothly and then it would load up, load up as in full throttle and a snail could get along faster. Turn it off and let set and varoom off she would go; this tells me it is electric.

So then it starts with the popping and cutting out but every time the driver brought it to me it was running smoothly....till it din't. At that time I pulled singular wires off of the coil pack and they all had big spark but the engine still was running ruff which told me fuel. And, then the insanity started.

I have three 70's that do not run so I have available parts to swap out, the third 70 is the one I am talking about. So, I took a coil off of one of them and it made no difference. Took a coil off a second one and no difference, so I switched that thingy that is under the air box, you know the sealed electric apparatus with the three cam over connections. And, it ran better but ran like a tortoise and real ruff. I figured it might be the transmission filter so it got changed out Wednesday morning because it was heavy and only a cup of transmission fluid came out of it. The traveling was faster but it was still running ruff.

So between two forklifts I swapped parts, (this is where the insanity started,) and I found that the 1/4 side of the coil was not active. I could only swap between two lifts, (swap electrical parts,) because the apparatus on the third lift had different numbers than the other two.

Now here is what I do not understand: How can only one side of a coil pack fire and only fire on all three coil packs? Remember: The original parts were firing both sides of the coil but now there is only spark on the 2/3 side of the coil. The only firing one one side tells me that the problem is in the electrical thingy that attaches under the air filter/box. But how can two of them be bad? So the problem is located elsewhere, but where?

Today I am going to swap out, (or at least take a look at,) the electrical plug in box that hangs on the inside firewall to the right of the drivers knee, but I do not think it will change anything because I do not think that the pick up spark travels to the console before it travels back to the coil. BUT, I could be wrong because the lil led screen does have the words "cranking" and that shows that something travels to the console.

So there ya have it, the reason this old post is still relevant.