Hey, just wondering what the best tuner for the price would be for my 04 FX4 screw. it seems kinda slugish, like it wont open up all the way untill the RPMs are at like 3.5-4 it kinda annoying, it also wont downshift if im in second gear trying to pass somebody like 25 mph? i think. just wonmdering whats the best thing for this problem, everything is stock, it just seems kinda slow, also my battery has died like 5 times so i final;ly got a new one. dont know if that has anything to do with it, when the battery was low and the motor stopped cranking all my guages started flickering and going crazy, I just thought id ask because i thought that maybe something got reset?? idk.. any help would be appreaciated, other than thatmy truck performs excellent . Thanks!