I fired up my car tonight for the first time. It idled fine for about 5 minutes then it started backfiring. I shut it down then fired it back up to adjust the timing and the AFPR blew fuel through the vacumm port. I didnt have the belt of the blower on I was just tuning the engine before I wind up the blower. Where should my fuel pressure be at idle? Was the fact that I had the external fuel pump working and the blower of have anything to do with it? Need help ASAP!!!
Thanks
David G.

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88GTA 5.7(under construction) ATI Procharger,58mmTB,ported plenum,SLP runners,Edelbrock HI-FLO base.ported heads,1.5RR,210/220/480 compcam,AFPR,SLP1 3/4 headers,3.70 gears,Eibach drag launch,Lakewood LCA`s, Nitto drag radials.