W201

88 190D diesel engine wont stop!!

I have a 1988 190d 2.5 liter NA. I started the car like normal except that the brake pedal was very stiff as though the power brakes had stopped working. Also when i went to turn off the car it kept running so i hit the manual stop on the fuel pump. So the problems are simultaneous. I heard that it is a possible bad vacuum but im not sure please help. thank you.

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