88 Bronco II Problems... Help???

Alright well ive been working on my g/f's brothers 88 bronco 2 for about a week... and cant get it running right so im turning to you for help.... he got gas one night and the car wouldnt start back up... i figured fuel pump because it would crank and crank and not start.... so i replaced the intank one and strainer.... no help then i found a loose connection to the battery and the relays... i fixed that but it would start and die not hold an idle or anything and id hear a grinding whine sound..... found the sound and it was the rail mounted high preasure pump... i i next replaced that... now the car idles and runs fine untill you go past half throttle then it back fires and sounds like crap and dies out.... anyone have any clue.... also i found a huge rubber house in the gas tank... that went kinda in the fill line to deep inside the tank... it was just sitting there not connected to anything... i just thought it maybe made sure the fuel was getting to the pump.... any help would be great.... this kid hasnt had a car for a month now and i really would like to be able to help him out....
thanks,
adam

the order wouldnt of changed it ran fine b4 it died... it seems like its flooding it with fuel or something... but ill check the coil

thanks for the help guys... i was leading to the IAC or a TPS sensor.... they were my next shot... lol yea idles like a charm revs fine if i go slow but as soon as i give it a good amount of gass it hezitates and dies out...