If my twin setup sells from my GTR im going single kando...
Which one though? Need response but over 450hp at wheels.
Current -9's have 400hp 19psi safely.
Use a test light to see if there is power at the injector plug when the key is on. 1 wire on all injectors should be powered. Will be the same colour on all injectors.
Then u need a noid light or LED test light to see if the negative trigger (the other wire on each injector plug) has a signal from the ecu when cranking.
Let us know how u go and will tell u what to try from here
Jap try setting the tps to .44V ish TPS closed. I know with nissan ecu .5V is borderline of not running in the idle maps.
With WOT u should be seeing near 4V. Check the throttke is opening 100%. If it is try another tps
While its clicking check that the power is constant at the solenoid.
Use a test light connected to the positive terminal and check if the negative is flickering on and off causing the solenoid to switch on and off.
If the negative is flickering at the plug check at the ecu plug to see if its a wiring fault.
Then if its still an intermittant signal it may be something like neutral switch etc playing up. Need to check all before replacing ecu
Completely Remove the turbo timer and return the affected wiring back to stock and see if the issue is still there.
May be an ignition switch issue or battery connections also
Always start at the battery, then fuses, then if there is still issue's check the starter itself or the wiing from the engine bay fuse box to the engine/starter loom