I have had my Nitro RT 3 weeks..........and since I picked it up I have noticed a slight rattle at slow speed acceleration......It seems to be getting more noticable as time goes by......I took it in for early service yesterday (1320 miles) Complained about the (Knock/Rattle) They said they could'nt duplicate it.......Hummmmm heard this crap before........So asked the service mgr. to take a ride with me.......Before we got out of the dealerships lot ......he agreed with me ....He said he could hear something.....More driving produced more noise.......It sounds like an old V6 thats very well worn.....He seem to think it sounded like loose wrist pins........So it was off to call Dodge and pow wow with the techs........said he'd call me........I hope he does.........Am very unhappy with this situation to say the least.....I love the r/t ...looks ...ride....handling.......but the 4 L engine leaves a lot to be desired.......noise...and gas milage not up to snuff....... Has any one else had this problem..........Thanks Wolfie