I have a 1994 K3500 with the 6.5L, i just put in a new turbo and high flow pickup pump, best power taking off I've ever had with this truck BUT when I let off the pedal it starts bucking and sometimes dies on me going down the road like it isn't getting fuel, it's been a great truck for me for the past 20 years and I'd kinda like to keep it, (only has 154,000 miles on it) any help/ideas would be greatly appreciated