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If they were flowing especially poorly before, then the long-term injector trim would likely be a fairly high value. I would expect that the short-term injector trim would be adjusted to compensate (assuming closed-loop operation) and you'd see no problem.
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if it doesnt go away after warmed up, i would suspect fast idle valve. I just replaced it on a 92 lude and it was doing exactly what you said.
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Nice approches. This is happening during warm engine idle. Note that there were no previous problems at all and there is no check engine light. Engine was running like a champ.
The injectors were working fine I just felt like giving them a bath.