Its been a roller coaster day for the Golden Cloud. The mechanic told me this afternoon that he could not reproduce the problem and that it could have been a rock in the belt or something rubbing. He added an additive and said I could continue driving it until something really breaks done. I show up around 6:30 to pick it up and the story is different. When he moved it to park it out of the way, the engine encountered the issue…a lot. Enough that he said he went “Bang Bang Bang Bang”. He thinks it may be detonation but they are going to do more investigation tomorrow.