I have the Mitsubishi Mirage Colt 1995 with the 1.5l 12v sequential fuel injected. When it's cold the idle speed goes UP and Down, and UP and Down, etc, etc until it gets fully warmed up. When warmed up, it still seems to idle too fast, because I don't get the amount of engine braking with my foot off the throttle, and when I put it into neutral at a stop, after about three or four seconds the engine slows down to a reasonably slow idle. I'm taking it in tomorrow, but first I'm hoping for an opinion about the problem. I have 3 Colts, and two of them suffer from this problem. I've tried lots of fuel injector cleaner, Berry Chemtool, acetone, with no help. Do I just need to order some rebuilt fuel injectors? or a fuel rail?