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so pretty much just off idle, like at a cruising speed? And when using cruise control, it does NOT do this?
From what I have been able to find, it may be the fuel pressure regulator on the rail- gets sticky inside and under idle or under full load will pop to one extreme or the other, but on that just off idle position it is stuck in the idle position. You can pop the clip off and remove the regulator and see if you can clean it out with some carb cleaner to remove the varnished fuel buildup