Hello All. When starting cold first thing in the morning, it starts off fine with no problems. However, when I start the car in the afternoon or after a short trip when the engine is fairly warm, it will fire off then die. There is a lot of black soot coming out of the tail pipe -- running too rich? Someone told me that it may be a cold start injector injecting when it doesn't need to be and making the mix too rich. There is a light to moderate raw fuel smell just after startup. Any ideas?