my 1980 300sd build
 

I wanted a summer project to i bought, converted, repaired the rust and painted this car. I got it from the original owner.
it did develope a problem yesterday. i started the engine to move the car in the morning, move it to the garage. and it shut off fine.. then later that same day it wouldnt shut off.. the door locks dont work now either. someone told me to plug a vacuum line with a golf tee. but i dont know where..

here are the pictures. let me know what you think.

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vacuum line
 

plug off the vacuum line connected to the one going inside for the door locks.(right next to the master cylinder)