I am unable to set te best idle because my car wont run for more than 5 seconds, Im beginning to suspect blockage in the fuel filter or a fuel pump on its last legs. the car was running before I had changed the fuel mixture setting which I now know was a big mistake. maybe someday Ill learn to leave things alone instead of trying to get something better from them. does anyone know if it is possible to have caused engine damaging/killing harm to my car by messing up the fuel mixture setting?

Thanks for all the help Ive gotten from this forum its the best source of info ive ever seen

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1984
190e 2.3L
107000 miles