starts then stalls

i have a 91 camaro rs 305 with tbi i just put a new 305 in replaced almost every sensor inc tps, IAC, oxy temp sensor new cap rotor , the car will start and die right away unless i disconnect the map sensor from the back of the throttle body then it will run for about 15 sec , i can keep it running fur about 40 to 50 sec if i give it some gas but it still dies its like someone just turns of the ignition no sputtering just turns off i replaced the map to but still nothing almost everything is new HELP!!!!!!!!!!!!!!!!!!!!!!!!

severe vacuum leak?

if you have a leak where your intake meets your throttle body after your maf it will do that....

air flow sensor?

i replaced all gaskets the only place were i could possibly have a leek is the intake if it is warped but i really dont think its leaking someone else had almost the same problem on the same car and it was the fuel pump but that just dosent seem right i was also thinking the ign control in the dis those parts were sitting for 5 months and when i replaced the cap there was yellow foam looking crap in the dis , also its not just the map if i disconnect another vaccum line at the same time it will run even longer