Just the other day I was carefully cleaing my engine bay with a spray bottle and a rag (not sure if this is what caused the problem but felt like I would add it just in case) and about 2 hours later I went to go for a drive and every time I pushed the throttle down to accellerate when the rpms were below 1500-2000 it would buck and sputter like crazy especially when in 5th gear due to the increased load. Once I got back home I pulled all the cops out to make sure I didn't get some water down around the plugs , none were wet, then I tested to make sure all of them were firing and they are. then I went about making sure the injectors were all working and they were. Well I went to bed very angry that night wondering what the hell could have happened. and the next morning when I got in it to go to work and it ran fine so I think whatever must have gotten wet fixed itself, but not the case instead the problem has seemed to moved up the rpms range, now it doesn't buck at low rpms but if you drop from 5th to 4th and stomp it to pass you can feel a slight misfire almost like insufficient fuel pressure. Have any of you all had this problem before, my car ran perfectly before this happed 2 days ago and not it just pisses me off. it also started dropping rpms bad when coming to a stop, sometimes down to about 200-300 rpms. like the iac is screwed. RIght now I am just looking to figure out what is going on with the stumbling at high rpms , have any of you experienced this before.