Checked distributor wiring. Only 2 wires going into dist. & both appeared in good condition with no open circuits present upon visual inspection. Unit had battery voltage to regulator & injector today upon cranking engine over. Got engine to start with sniff of ether. Ran good at high idle. Runs rough at low idle & close to stalling. Shut engine off. Attempt to re start. Will not start unless ether it. Attempt to adjust fuel trim screw on regulator all the way in & out with engine running at low idle. Had no effect on runability. Drove unit. Unit runs excellent with plenty of power from low to max. RPM's. Any additional tips could give me? What is the resistor for next to the ecu?