My bet is the accumulator. It holds pressure in the fuelinjection system after the engine has been shut off. If the engine is cold and you get it started try shutting it off. if it starts right away it is most likely the fuel accumulator.

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1990 190E 2.6
1996 Grand Voyager 3.3
1985 Mustang GT 5.0 5 SPD
1982 Suzuki GS 750T