1990 300e laundry list

[patc]

Well its time to catch up on some small items but I need a little help. Here goes...
1. The resonator fell off today. It broke off at the weld to the tailpipe and the resonator looks fine but should I try to cut out the piece of pipe in the unit and try to have a short piece of pipe welded back on and then to the pipe?
2. Coolant expasion tank has a sensor in it and the socket that is on the wires that plug onto it has cracked and will not stay on. Where can I get one and what is it called?
3. The alternator was replaced and now the radio will not come on. I have the "code" but all the display reads is "wait" and never changes(wife not happy!!).HELP
4.Tube leading from side of valve cover to top of air cleaner has a small vacuum line attached (or was) to it. The tube cracked at the connection place for the vacuum line. Once again where can I get one and what is it called?
5. At the point where the tube previously mentioned goes into the top of the air filter there is always a puudle of oil. Can anything be done to correct that
6. Car uses about 1 qt. of oil every 2000 miles. Car has 218000 miles on it and runs well. I see no smoke and no significant leaks(other than that mentioned). Any clues?
7..Last one , occasionally on accelerating from a stop, the car will hesitate, tune up, cap& wires have not corrected it, occasional. Where do I go from here?

Thanks in advance for your help!