I'm not sure if these two things have anything in common but...I have been fighting a rough running car for a while now. I am not getting any codes and it always passes the cylinder balance test. I have only owned the car (86 GT, H/C/I and MAF) about a month and I have only driven it a few times. The last two times that I have driven longer than a mile or two, I've noticed that every few minutes the temp gauge will rise to almost the H and at the same time my fuel and oil pressure gauges will rise too. They will stay there for a second or two and slowly fall to normal. They will then do it all again a few minutes later. I am also getting bucking and surging at part throttle most of the time. What can gauge all of this?
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