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Message: [QUOTE="IBSTROKIN, post: 323475, member: 3969"] As some of you may already know I have been fighting a FRP issue that makes my truck buck and bounce between 45-55mph. It all started after installing ported fuel rails. It looks like they do not play nice with stock pump and injectors. Tried just about every tune out there with no luck on solving the issue. Matt at Gearhead has been looking into the issue and working hard at trying to find a fix with tunning. Awesome guy to deal with. Never expected him to put this much time into it. I was told that unplugging the fuel temp sensor has worked for another member. So on a last desperate attempt before forking out money to put my stock rails back in I gave this a shot. It seemed to work but my engine fan stayed engaged and sounded like a Jet was about to take off from under the hood and of course it threw a code. I got Matt to set the fuel temp at -40 which is where it defaulted at when it was unplugged. So now I could leave it plugged in and it would read -40 all the time. After some testing the issue is still there but only for about the first ten miles I drive the truck. After that she is smooth as stock. I am guessing engine or fuel temp is playing a part in this. Not sure what to make of this. This is a hell of a lot better than before where the bucking was there all the time. So its one step closer to a permenant fix. Maybe someone that understands the stock fuel system better than me can shed some light on what is taking place with the sensor unplugged and how thats effecting FRP [/QUOTE]