help?! possible power loss.
 

hi guys, i dont post too too much and im not a mechanic so try to go a lil easy on me. here is my dilemma, i feel like after 10 mins or so of normal driving, i lose a lil pep in my step on the accelerator. il do a WOT during the first few minutes of driving and it seems like a pretty normal acceleration. then it seems like almost everytime 10-15 mins into driving i lose some pull power in the butt dyno, and i know it sounds silly but could it be the CAT getting hot, the only reason i say this is because it almost sounds like i hear a faint rattling or crackling going on underneath me when i accelerate.

any help is much appreciated, and i thank you in advance for any response.


if there is not enough info for a diagnosis just let me know if there is anything else i should try and listen for or anything...im almost to my 60,000 mile warranty mark so i have about 700 miles to try and figure it out

i do apologize for the double post...i think i put it in the wrong section the first time.