Hi everybody..

I tried to swap the LS2 engine in my silverado 2006 model and there was a problem with engine tuning please I need anyone to give me information how I can fix the engine in my truck, and I want to tell you that I use standard intake and throttle body for the 5.3L engine, but after I used my truck more than 500miles I had problem , the spark plug broke and I had more heat for one valve in the fifth cylinder head , but when I turn the car on and drive normaly there is no problems, but when drive it in high rpm the problems comes. I tried to tune my car by the hptuner and every thing is ok in dyno test , but when I drive in highways with high rpm the problems also come. I will realy appriciate if anyone would help me.

THANK YOU!!!.......ojoojo