Ok, my truck is an 08 F-250, and I'm running the Spartan 310 tune. I was driving, and gave it some gas at about 3/4 throttle and it did fine. Then I let off the gas and came to a stop light, and when I tried to go again it was running really sluggish and not near the power I was getting. Now the truck isn't building boost like it should be. Its not building up any boost from a dead stop, but will eventually get some as it gets going. So from what I can think is that the smaller turbo just isn't spooling up anymore. So I dont know what it is or what I can do to fix it. And I really dont want to have to return everything to stock and try to get a dealership to fix it. So any help would be appreciated!!!