Quote Originally Posted by Maxdout1 View Post
Im having the same problem on a 06. I put 8 new gm injectors in and still having the same problem. It only does it at wot and when its warm. Pump at idle you can ramp it up to 24000 psi and hold it all day. when it warms up it will command 26000 and drop to 12000

I can only speculate that you may benefit from some tweaking in the tuning. This is ASSUMING thatyou are not running a plastic bodied fuel filter and have no excessive restriction.

I'd probably start by lift pump supply pressure first.