Reply To: GD250N – Hanging Revs and Stalling when Throttle opened quickly
When it runs , tell us the voltage of the battery at idle and also at 5,000 rpm. (Regulator test)
Fuel Pump Relays failing can happen but its not uncommon , the fuel pump draws a LOT of juice all day long. Replace with a new relay if in doubt and also make sure the contacts are clean (while you clean every plug on the harness.)
You will be amazed at even a rusty fuse can cause a 1 (one) volt drop enough to cause problems in the EFI system or a fuse that’s too old, replace fuses as precaution, the harness should have more stable juices flowing everywhere now.
Then recheck ECU for any codes later.