Sounds like some type of total obstruction in the intake system. Its sucking fresh air through the oil cap. THere sure seemed to be alot of suction on cap when he removed it.

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1985 300 TD 448K
1984 300 TD 278K

1983 240D euro 240k
1994 f-250 idi turbo 330K
1986 f-350 IDI
1987 F-350 IDI

1985 JD 1050 4wd
1965 IH 3660