I started noticing a little bit of a shudder in my idle after I ran out of gas one day a few months ago. Lol. I know. A totally different issue there. The idle before used to be considerably smooth with just an occasional noticeable blip. But nothing consistent. I have since ran fuel injector cleaner, changed all the spark plugs, put all new intake manifold gaskets in it, and a new tensioner and idler pulley. It also has a new serpentine belt. The issue has not really changed. I also took the tune off of it and re-loaded it to make sure everything was reset. The car runs fine and the performance has not been affected at all. It’s only when you sit and idle that you notice it. I would think if it was an injector or a coil pack or some thing with a cylinder it would be throwing a code. My only other thoughts would be could a water pump or another pulley having issues cause this sensation? Or possibly a fuel pump issue? Just looking for brainstorming ideas to troubleshoot this. Thanks.