ok i have a 90 s5 na that is not idleing right at all. one day it sits at 750 like its suppose to then it wants to at 1000 at a couple times it has sat at 250. isnt suppose to also sit at 3000 rpms for like 10 or 20 seconds to clean it out when u first start it cause mine doesnt. i have changed the plugs, wires, fuel filter and have put fuel injector cleaner in it. im lost on what it could be. please someone help.