I just got new injectors from sheid, they are bosch with bosch 100hp tips on them truck runs awsome and feels like it has more power than before (Getting 57lbs of boost and at wot 26500 psi at the rail). But when holding a constant speed like at around 60 to 65 mph the truck pulsates boost moves up and down by 1.5lbs of boost and rail preasure gose up and down by 1,000 psi. just wondering what is causing this, It is not the preasure box I unpluged that and still dose the same thing. I think it may be the tune (4.2) with these injectors. If that is what it is I would like to try the 4.3 or 4.4 if any one has it not sure what one is better. I love the 4.2 it has lots of power, but you look at the go peddle and it makes your head hit the head rest. but i am just wondering about the pulsating while holding a constant speed??

 

No ideas hu? well it dose not do it as bad with the mp8 unplugged but the pulsating is enhanced when it is plugged in I am guessing cause rail preasure is enhanced a little bit at crusing.