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It could be the spool valve in the injector sticking on cold starts. If it persists during warm running (if you have a miss, surging, rough running) I would be concerned.
I have to ask, why are you revving it so high when unloaded? If it isn't missing when under load, why are you concerned?
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2005 Excursion - and I am not Racer X from Pasadena Texas even though this forum seems to confuse me with him. I wish the moderator would fix this issue!
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