CM2250 Fuel issue

[Jose9640]

Looks like I have a huge leak somewhere just not sure where to start. When doing a fuel injector performance test they all pass. Did I a leak down test and pressure dropped from 29k to about 500 in 20-30 seconds. Truck shakes and stumbles on a cold start up. Clears up after about 15 seconds and runs just fine after that. Once truck warms up it runs great and no smoke. Where should I start? Injectors?