ok i just put in my vortech on my 06 gt and tuned it with the diablo that came with it, have not changed the spark plugs yet but about to. now when i hit the gas in first gear as soon as it hits 4000rmp i hear alot of popping in the exhaust and it loses power, until i shift to second, then same thing happens there at 4000rpms. could it be that not all the gas is being burned up? i wonder if the plugs r the problem or its not getting the right mix of air and gas? any thoughts?