Fix your vacuum leaks on the engine and this will help prevent that, as it creates a negative pressure on the distributor and will keep oil from being forced into the distributor because the engine crankcase is under negative.Yes it was.
It was only a misfire! I met with Jonheld and he was convinced it was a misfire but I wasn’t sure because there was no dip in the tachometer needle, but he was right. I knew the rough idle was definitely from the oil in the distributor and was shocked to find the driveline issue to be related.So a misfire then? Funny how you picked that up without feeling the engine misfire, still a good fine for sure. well done that man!