Voltage drop in crank

I have rewired my car with an EZ wire kit and have added MSD ignition along with FItech EFI.

Now I wired the car per EZ wire instructions, which gives me 12V on their "coil wire" in RUN and CRANK which I used to feed my MSD and FItech.

The car will fire and then die when using the key. However, if I put the key in RUN and jump the starter relay, it fires.

This tells me I have to big of a voltage drop on the 12V coil wire when using the ignition switch. I haven't put a meter on that wire while cranking, to see what the voltage is, because I need a helper.

What can I do to solve this? I thought about adding a relay into the 12V coil wire or wiring in a push button start (last resort)

Thanks for y'all help.