I tried breaking loose all the injector lines at idle and found no difference. However, that was earlier when the misfire was not as pronounced as it is now. I'm gonna try it again.
Although my daughter is pretty sharp and aware, at least for a sixteen year old, the gasoline is a possibility. My son who is twenty and a college student who knows more than anyone else on the planet (at least in his mind) has driven the car some. He would be much more likely to have added a little gasoline.
I've never had a thermostat intermittent, but if someone else has seen it, it must be possible. I have a good thermostat and it's easy to change.
Thanks for the responses, I will check a few more things. But keep the thoughts coming, I appreciate everyones help very much.
Wish me luck,
'84 Euro 240D, 523K miles
'88 300E 5 Speed
'81 300D Daughter's Car
Over 800,000 miles in