Three things to check, First Fuel pump, Second fuel pump relay, third and a lot of people miss this one, there is a fuel regulator connected to the fuel rail. Its kind of round and it has a vacuum line connected to it. Its up on top of the engine, kind of to your right side of the engine (if you are standing in front of the car) Make sure the vac line is connected. The fuel regulator maintains fuel pressure to the injectors, with out the right pressure you can have this problemCheck all three of these items either one of the three can be intermittent (a sometimes problem) Good luck Dave