88 Civic D15z1 Swap, Getting Engine Code 16 What could it be?

[8Civic8]

So i swapped a d15z1 in my 88 civic sedan. I managed to convert it to mpfi, got most of the bugs worked out and finally was able to get the car started to where it stays on. I keep getting engine Code 16, which means its a fuel injector problem. I ran through the diagnostic check in the 92-92 honda civic manual (same as 88-91 civic manual except no resistor box is needed and resistance is different) and i get to the last part where it asks me to try a different ecu. I have a P07 which corresponds to that engine, and i substituted the edu with a P13 (OBD1 Prelude, which i know works fine) and the car starts as ussual but i still get Code 16. Now i know that it might be related to the fuel pressure and the main relay.

I re-soldered the relay, but it showed signs of having been repaired in the past. this didnt fix the problem.

The only thing i can think of now is the fact that i have not changed the fuel filter and that i used the 88 civic fuel line, i just twisted it so that it would fit correctly, Could the fact that i didnt use the VX engine fuel line cause this problem? Ive been meaning to get a fuel pressure tester but im not sure what to look for when purchasing one.

has anyone had this problem, or know how i might be able to fix it?

Thank you in advanced.