Join Date: Apr 2008
Location: Beeville, TX
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Me thinks your HPFP is a bit flaky. Scan for codes, you may find a P0087 (fuel rail pressure low). Mine would do exactly what you are talking about, then it got worse to the point that it wouldn't go over 35mph. The shifting is screwed up because the you don't have any power. The boost is screwed up because you don't have the fuel to burn to make the exhaust to make the intake charge.
Tuners have been known to cause a weak HPFP to go out. It would have gone out anyway, but it would have taken longer.
Eli Benson - EMT, Ambulance Mechanic
'08 F350 Dually KR - Spartan'd
'07 F250 CC SB 4x4 XLT - SCT /w Innovative Tunes
4 '09 & '10 E350 6.0l ambulances
1 '08 Duramax 6.6 (LMM) van ambulance