MileHighSierra

Hey there. My rough idle when cold and stuttering on high throttle openings has been fixed. However, it sometimes feels like it is "starving" for fuel if i go to WOT right away.

When I roll into the throttle from 15-100%, it makes really good power still.
I took off the fuel pressure regulator when i did the gasket and it looks fine and didn't leak.

FFDP

iTrader: (2)

Did you check pressure at the rail yet?

Got a scanner to watch fuel trims and see what going on??

Make sure you don't have any exhaust leaks before the o2 sensors as well.

MileHighSierra

Good call, was going to check fuel pressure next. My scanner screwed up and isn't working.

Wolftrk99

iTrader: (5)

Pin hole or loose air intake hose could cause the p0171 code...there are actually a lot of causes for that code, have seen broken exhaust manifold bolts cause it as well

Sevex

Just ran into two trucks at work throwing this code, ended up being plugged injectors on both of them. Must of had a bad batch of fuel at the company fill site because we had a dodge doing the same thing as well