Odd series of event (not diesel related-i think)

[190E-Bpy]

1. My 1996 E300 engine cover dropped from the front and dragged down the highway for 10-20 miles-ground it down pretty good)- i managed to fit what was left back up under the bumper cover part and it tucked in and stayed -planned to replace or remove, my old 190E lost it around 260K miles

2. About 1-2 weeks later 2 of my fan blades were missing and I had a gouged radiator on the way to work barely getting me to the mechanic- only hit 108 at max when stuck at a light - lost a lot of fluid of course - My diagnosis was the fan shroud was popped free from the bottom tabs when i was cleaning the highway in part 1 and the blades hit the shroud ripping on off completely and the other partially

3. Radiator, fan (not clutch it was OK) and belt were replaced. My CEL light came on and the mech. told me to bring it back as the car ran fine and didn't go over 100 idling for a while but he did want to check the Check engine light (CEL) issue.

4. On my way home the car was shifting hard into 2, 3 and 4 and not hitting overdrive easily-

Could the flying fan bits have compromised my vacuum line going to the tranny? Would a vacuum issue set a CEL error. I need to get them diagnosed/read but this occurred on friday and today is sunday.

thanks

On a side note, my CEL would come on whenever my fuel got below 1/4, but a fill p would clear it - i attributed this to an old cap that needed replacing. Fuel delivery/pump run by vacuum too?
Once again it's a 1996 E300