So I bought HP Tuners to tune my C5 Corvette, everything with that went perfect. I ended up buying a 2003 GMC Sierra more recently, I've been wanting to tune it. I installed a boost valve, increased the PW 20%, boost 20%, and torque management proportionally, I also used the timing calculator to set the base timing, and modified the shift profile. So I loaded the new tune in, took it for a spin just to be disappointed. I don't have much for gauges yet but it felt like the turbo was shut right off. There is no smoke, no unusual noises, but the truck is just gutless. There is no torque to climb hills or accelerate, it feels like it just isn't fueling, so I went back to the stock tune. What am I overlooking?
Thanks in advance,
Jeff