[truckin 79]

Hmmm I think you are right looking at the internet. I had a 68 Nova that had a heat riser that would stay closed until the bimetallic spring warms up and opens. I was looking at the heat risers with vacuum pods and they are open when vacuum is not applied. I guess I will unplug it and see if this is the proble, well obviously this should help with a lot of problems. There was just so many thermal vacuum switches on the 79 and I thought I was making it better.........guess not.