So I have a 2003 F150 with the 5.4 and I did injectors and it was running great for around an hr and then it got really boggish and accelerated horribly. I figured since I got cheap injectors that was the issue so I got bosch ones for it, the issue is still there after messing with stuff its still there but alot more mild. It idles and accelerates great on idle but as soon as it has load it becomes boggish almost like there is misfires it shakes and you have to throttle a little harder. P0171 is what I have and ive gotten P1151 in the past. Any help or suggestions are greatly appreciated. If its new injectors so be it.

 

Why wouldn't you try putting your old injectors back in first?

Although, I lean to injectors not being related.

What do your fuel trims show? What's the fuel pressure at the rail?

 

Original injectors where leaking, so they are a no go to reuse. And as for fuel pressure it read around 39.

 

Sounds like a pretty bad vacuum leak on that bank. Bad enough that the O2 sensor “sticks” as well.

 

Agree with the replies
Check every hose hitting that intake (one is off)?
Check the short term fuel trim
Check codes and pending codes, that can sometimes be the key as to what you left off or unplugged
The way to test those injectors is to manually fire each one while monitoring the fuel pressure drop
That's easier said than done of course but easier than swapping injectors with no idea of the outcome

 

I've checked every vacuum line they are all in I even checked if they had holes or tears and nothing.

 

Cool, now start checking sensors
Were you able to read the codes?