what would make it pass then fail and repeat whould it mean there is engine wear or problems

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Dan Younes
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1985 euro 500sel 223k
1981 300sd 278k sold
1979 240d 298k sold
1983 300sd 272k sold
1989 chrysler 2.2l Turbo
Leabaron 140k
1989 Dodge Carvan Se 295k
1996 C280(hopefully soon)