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Message: [QUOTE="bigfords, post: 1524034, member: 7066"] Hey guys got a 6.4 that I'm a little stumped on. Wondering if anybody has any input. 2008 6.4 that would fall on its face on first acceleration, rail pressure would drop to 1200psi and then bounce back to the commanded 8,000psi after a second or two. Had codes P0087 and P2291. Otherwise truck ran well, and is a bit smokey. Replaced HPFP, LPFP, Fuel rail pressure sensor and under valve cover harness. Got truck back together and truck is doing the same thing, but possibly worse. Now the fuel rail pressure fluctuates from 3,000-6,000 psi at idle. Truck still falls on its face on first acceleration, stumbles, then rail pressure jumps back up where its supposed to. PCV valve seems to be what is fluctuating causing the issues. Any ideas what could be my issue? Truck is ******d and tuned, (H&S). thanks! [/QUOTE]

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