hi everyone, i'm new to this site and using it on my dad's behalf!!

we have a tad problem, my dad has a 2004 dodge heavy duty ram 2500 and had the juice engine management fitted, great bit of kit but it's been fitted for about 2 and a half years and has stopped working correctly.
it's tempremental in weather or not it does anything and the truck is alot slow 0-60 etc (like 4 seconds ish in each stage)

the engine management light keeps coming on and off temprementally and the mpg seems a few lower!!

is there anyone with this kit on there truck and have they had any problems and how did you over come them???

many thanks, jake.