RB20 wierd fuel cut?

[91boosted240]

Ok here is whats going on. i just recently got my rb20 in my car got it fired and my head took a dump on me before it did that it was running not for long but it was. i had a spare head checked and tanked. i got it all assembled and running again today well sorta. it sometimes will start right up and goto idle and sometimes it takes 5 min to get it to start. but when its running and sitting there at idle and you tap the gas it just wants to die and wont come up on the idle. i had to kinda jimy rig the fpr since it wasnt opening and letting fuel in but i put a cheap regulator on it and made it a constant flow. im kind of stuck on if its not getting enough fuel or to much. the only reason i did the fpr the way i did is cuz i ended up loosing my job and have no money. any sugestions on what i should try or do? thanks in advance and hope someone can help me out

[Joe]

you should get the right FPR.