My dad has a 2006 and we installed a superchip flashpaq 2805 on the tow mode. The other night when he got on the throttle a check engine light came on, so we hooked up the chip and read the code it said low fuel rail pressure. Has anyone had this problem or should we install it again or are there other problems. The truck is stock. Thanks

I wouldnt expect the superchip "tow" mode to be that "hot" of a tune to throw a low fuel rail pressure code... quite often these are expected when running "hot" tunes with EFI live/PPE hot +2 ET with no lift pump/single CP3's...

I would check your fuel filter first, perhaps its limiting fuel due to gelling, water, filter element blockage.