My truck is starting to not idle. If I put it in neutral at a light and hold it at 1500 it will be fine. If I leave it in gear it misfires and then sputters as I take off. It has to Rev up to clean out.
It reminds me of my old drag car loading up and runs better after snapping the throttle to clean it out.
I have no idea how a fuel injected engine would do that. The idle sometimes cycle up snd down too.
It only seems to happen in closed loop.