When I changed my injectors I replaced the holders and O rings (and tubes). They kind of snapped in and the holders didn’t seem to press them. Did you replace these items? The parts are not expensive. If they didn’t seat I bet there is a problem. Did they all seem to go in the same? MHO

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Steve
1985 Mercedes 500SL Euro (Gray market)
1995 BMW 520i Euro (Gray market)
1992 BMW 525it Wagon
1994 Honda Del Sol Si