Xue Sheng
All weight is underside
Plugs changed, compression check was fine so the valves are good, and all seems to be well with the car. All the plugs were pretty well fouled (they have 25K on them) but #7 had the electrode totally collapsed. I'm sure that's the one that was missing so badly.
NAH!!!! it was more likely the framis gasket or the fooshalator valve