Power drop (loss) around 2-3k RPM

[parker575]

Been noticing more of an erratic idle again. I've replaced every single vacuum line in the car (including stuff under the intake) and then it ran great for several months. Now it seems to idle a little crazier again and am also losing power between 2-3k RPM when I'm driving. When I get on the throttle it goes away, but when I'm just holding speed it's there. Feels like a misfire but a bit more gentle. Plugs look OK.