Hello, I have a 1993 Mazda 626 which has developed a engine idle surging and cutting off problem. I originally thought that it was a transmission issue, which needed repair anyways, but that has been fixed and the issue is still there. Basically the car runs fine, but on ocassion it will rev high up to 2000 rpm on idle. When that happens and you place it in drive the idle will falter and the engine will die. If at a stop light when this happens and you give it gas, it will falter and cut off or spit brown smoke, not black or blue, but brown smoke out the back. It seems as if the engine is flooding with gas caused by an inaccurate signal sent to the fuel sensors by the temperature sensors etc. Not sure!!! Anyone out there with any ideas? Have you seen or heard of this before?