I have just changed out my HPOP and installed 8 new injectors in my 2004 6.0l. The truck drives good but at about 1250 RPM it has a studer but if you accelerate or decelerate it goes away. But when I do a code check it gives me a P0270 Cylinder #4 injector low circuit. Has any on any ideas I have checked the connection to make sure it was hooked up and also cleared the codes but it continues to pop up. Thanks.