gamble

the car 1996 hatch with b20 with b16 head with supercharger. tune with chrome with p28. the problem is that when the car is rolling with my foot on the clutch or in neutral it idle at 1000rpm, but when the car comes to a complete stop, the idle drops down to 300 to 500 and works its way up or it will die sometimes. when the weather is hot it will die at a light and it takes a long time to start. it like it out of gas
my fuel pressure is 40..........
its not the throdle body..........
could it be my MSD igh..........
or my MAP.........