Well i put the 4K gsk kit on about 4 months ago and when i did the truck would go to 3500+ rpms easily, though i rarley did. Well it wasnt running right about 2 months ago, it was sputtering on top end like it was running out of fuel. I replaced the crappy looking fuel filter and it ran good, though i didnt try high rpms. (only went to 3200) Well today i try to do a drive by and i romp on it in second gear and where before i could turn 3500+rpms now the truck stops fueling at about 3200 and falls on its face like it did at 2800 rpms with the stock springs. anybody have any ideas as to what could be wrong? i want it running the way it was before. I have also noticed that i have to push the pedal harder and farther to get the same responce i used to when i first installed the kit . Please help.