Actually my wife's car inherited from her dad, I think the odometer has rolled over at least twice. Motor was pretty dirty so I sprayed on engine cleaner and washes it down with just the hose to find a coolant leak. Bad hose, so I replaced both. Now it runs super rough and sounds like it's missing. This makes no sense. I let it sit for a week, started it up, let it warm up and took it for a hard test drive, no improvement so I threw a timing light on it and it's retarded past the marks. It looks like there is a bolt holding a collar at the base of the distributor that I can loosen and set it to TDC I hesitate to do this since it was running fine before. All I did was wash it. 1. Can anyone confirm this bolt crammed up against the block is the one I loosen? 2. Car had a full tune up including cap, rotor, plugs and wires. 3. Is there something I'm missing? I've timed American cars and have the wrench but the English cars are new ro me