so i got my truck back friday night,and theres alot of clatter in the engine. it feels like it wants to turn off when im doing 55-70 at 1,100-1,500 RPMs.its starts clattering alot and jurking forwards. and im wondering id its because i have the 5.3 tune on it not a 6.0 tune on it.....and in the past two days i've wasted 3/4 of a tank and only gone like 180 miles......