1992 Chevy Camaro No Idle

My camaro RS was running and driving just fine a few days ago. I parked it in a parking lot for about a half an hour then it won't start. Now after towing it home it will start if I prime the TBI carb but when I let off the gas it dies. If I hold the gas it dies. I have to feather the pedal or it dies .I bleed the air from the fuel line and replaced the fuel filter and still no luck. I even siphened the fuel completly out and replaced it with new and still it won't hold an idle. I'm open to any idea's anyone has cuz I about out of them.