we done a 6.0 engine swap on a 2007 Silverado work truck that had a 4.8. it has texas motorsports cam with a .275 lift and valve springs. we have a new complete throttle body and gas pedal assembly. we have also redone all the grounds just to cover our bases, also has a start up tune on ecm. the truck only has one code and its a u1301. it runs and idles perfectly, but when you reach 42% acceleration it goes into reduce engine power