Every once in a while, when I start my 1998 Maxima cold, it starts, then dies. I sometimes have to do this 3 times, then finally I get it going by slightly tapping on the gas pedal. After that, it runs perfectly, as normal. Any ideas? Does this engine have a cold start injector, or could it be my coolant temp sensor that is telling my computer that the engine is warm, therefore not injecting extra fuel needed when cold? All tips will be greatly appreciated.