Just to add a bit of confusion, I just went through the exact same symptons on an intrepid.....For two weeks my friends intrepid would start cold but not restart when hot. Much simplier system to work on, but it turned out to be the ignition switch. We have colder winters here and I'm wondering if this contributed.

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1995 E320 -171k-km
1995 S420 -333k-km