I'm having an idle issue that arises every so often seems to happen at random and can't seem to pin point what may be causing it. After intermitant driving and coming to a stop the idle pulsed between 1300rpms-1000rpms. Any ideas of where to start would be appreciated. This is my first EA and not super familiar with its in's and out's yet. So far it has been a great daily driver after fixing a leaky valve cover gasket. Car has about 179K on the odometer. Photo below.