Friend of mine had the same problem but it would also run really ruff some times at idel. At first we thought it was a ground because he could mess with the wire and it would start. We did not think it could be the HEI because it was only 2 mounths old. I figured out the vacuum advance was not working so we decided to swap out the hole HEI. It solved all the problems. The vacuum advace fixed the ruff idel and all I can figure is there was some type of short in the HEI.
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