okay i have a 91 rex with 88 si ecu and a d16y7. it doesnt run right and im not sure if its converted to mpfi or if he has it running dpfi. theres 2 thicker blue wires coming out of the firewall to the injectors, right before the injectors 2 little blue with white stripe wires come out of each wire, and go to the injector wiring. does that mean its dpfi since theres only 2 wires feeding all 4 injectors?

 

okay i think its right 4 wires connected to ecu, then 2 go into one blue wire 2 into the other and they come out like that at the injectors

 

2 of the injector wires you use from the dpfi harness then you run 2 more straight to the ecu for the 2 extra injectors. then you run 2 wires from the dizzy to the ecu. so total of 4 wires you add to the ecu.