[84LX89GT]

Another thing i just noticed is that you have a 255 lph fuel pump. I don't know when you installed that, but after i installed mine i got a severe misfire at lower rpms, hard to keep running cold and when it warms up to operating temp it mostly goes away.
Anyway, after checking fuel pressure and seeing 85 psi no matter what the adjustable regulator is set at, i disconnected the return line and ran a hose into a bucket....fuel pressure dropped to 35 psi and the car ran fine. I reconnected it and disconnected it at the fuel pump and the pressure went back up to 85 psi, the return line was restricting flow and sending out my 30lb/hr injectors (30lb/hr flow at 85 psi....that's alot of fuel!) 255lph is too large for the return line size of 5/16 (i believe that's the size) so i now have to buy new AN fuel lines, fuel pickup and fuel rail to run the 255 lph pump.