I have a 1966 mustang gt with a 302ci motor in it. i rebuilt my holley 4150 650cfm double pumper (man secondaries no choke). when i got done i put it all back together and i noticed that the secondaries dont spray fuel at all, and the engine will not idle at all if i take my foot off the gas it will die and if i give it alot of gas it will backfire. it also sometimes backfires when trying to start it. i am trying to figure this out but i have no idea whats going on with it.