12 valves will not self bleed. You have to manually bleed each injector.
Unplug the fuel solenoid and crack each injector nut loose. Have someone crank the engine until you see fuel spraying out of each injector line. Tighten each nut and then re connect the solenoid. Start the engine and while it's running crack each injector nut loose again. If you can hear that cylinder drop when you crack the nut, then it was bled. Tighten the nut and move on to the next injector. If a cylinder doesn't drop when you crack the nut then it still has air in the line. Let it spit the air out until you see fuel. When you tighten the nut. The cylinder should start firing.
Hope this helps.
I haven't cracked the nuts loose while it was running but we did crank it over and get fuel to squirt out.
I'll try cracking them with it running.
Thanks!
Definitely takes a bit longer than cracking a line though.

