Hey guys, I just joined the forum as I have been following this thread and other similar ones on this forum and found a lot of useful information on here.
Anyway I was experiencing similar problems with my VZ ute with it breaking down when I got around the 80kmh mark and it not quite idling right so after some research thought that I had dropped a coil. I was a little daunted at the cost and what was required to swap out the coil especially regarding the fact I had to at least partially remove the intake manifold. While I was looking under the hood I notice that there was a little air/vacuum hose coming from the front of the intake manifold down to what I now think is a solenoid that had split and this was the cause of the issue. I did some more research on here which is where I was led to believe it goes to a solenoid and that you still needed to remove the intake manifold to replace this and that the replacement part would of cost between $80 to $140 from various sources.
Anyhow I needed to get it sorted pretty quickly as when I played around with it (trying to wrap some tape around it as recommended on this forum) it actually came apart in my hands. So I borrowed a mates car and went to Enzed and got a small length of rubber hose and a brass elbow which I cut down and put two 40mm lengths of the hose on either end and fitted it in which has fixed my issue perfectly - car now runs a treat.
See below picture and BTW I also gave the car a good degreasing after I took this shot.
Thought I would share this as it may save some people some time and money.