Son took car on couple of errands, no problems and after it sat at 4th stop for about 45 mins, came out, started, idle was very poor so he shut it down. Tried to restart several times, only cranks, no start. I checked battery connections, fuel pump fuses, fuel pump relay clicks when you try to start. I ran the gear shifter thru park to low 30-40 times and when I tried to start, it fired, ran very poor and stalled. Tried again, nothing. What next?