Need help with a loss of power

[justadodgeman]

for some reason my 03 ram hemi has lost a lot of power. when im doing a brake stand(burnout with brake held) it will stay at like 3,000 rpms when just a few weeks ago I could have it bouncing off the rev limiter.and also climbing hills it just doesn't want to pick up speed like it used to and almost feels like the tranny is slipping but I don't think it is. also loss of gas mileage. Im thinking its a busted cat but its only got about 110,000 miles but then again I drive the hell out of it haha I also just got under my truck and hit the cat with with my fist and it did make a noise but it wasn't a rattle but more like the whole honey comb was moving in it so it was more like a clunk any ideas are appreciated guys

 

[Redtruck-VA]

Sounds like the cat is bad. Have you done the TMR mod? And I would carefully check the trans fluid level.

 

[dodge dude94]

If your cat makes any noise when you hit it, it's bad. Period. I wouldn't drive it much at high speeds until you get that cat/cats replaced.

 

[Redtruck-VA]

Stock exhaust on a 03 has a single cat.

 

[tornado_tech]

Another thing you might check is to see if got a broken valve spring which hate say by reasearch is a coomon problem in your year of hemi as my 2008 has 2 on cylinders 1 and 3 with 66000 miles