I have been trouble shooting a rough idle and stumbling acceleration on my stock '85. I'm using the excellent online L-Jetronic guide posted here and trying to get through the process methodically. As i was changing some of the vacuum system hoses today, I noticed a slow, steady stream of bubbles coming into the radiator expansion tank as the engine idled. I suspect the bad news is a head gasket leak. Would that explain my symptoms? I retorqued the head bolts to 65ftlbs and that did not help.