You should check the voltage out put it should be 13.50v or more if it's less the you have a problem with the wiring or alternator
Check your MAP sensor, The next time your car has this problem try disconnecting the MAP sensor and see if it starts. If it does, then replace the map sensor. On the throttle body there are 2 sensors opposite the throttle cable. the one more towards the front is the TPS sensor (throttle position sensor) it has a 3 pin connector running into it and the sensor right behind it is the MAP sensor (manifold absolute pressure sensor) and it has a 4 pin connector running into it.
Good luck and hope this helps.
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