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Not familiar with the 2.5l but I'm pretty sure it has a vacuum shut off. You probably have low vacuum either because there is a bad diaphragm in the shut off valve, a leak in the system, or a problem with the vacuum pump. You'll need a Mity Vac to diagnose the problem. Alternatively, disconnect the vacuum line going to the shut off and suck on it hard a few times. If the engine shuts off promptly, you know the problem is in the vacuum system somewhere and not a bad shut off diaphragm.
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1977 300d 70k--sold 08
1985 300TD 185k+
1984 307d 126k--sold 8/03
1985 409d 65k--sold 06
1984 300SD 315k--daughter's car
1979 300SD 122k--sold 2/11
1999 Fuso FG Expedition Camper
1993 GMC Sierra 6.5 TD 4x4
1982 Bluebird Wanderlodge CAT 3208--Sold 2/13
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