Hi, does the check engine light go on? or did it go one around 40,000 miles and idle rough...there is a mfg defect on some of the 5 cylinder models value heads need to be replaced, did you ever get a letter in the mail. i got one a couple of years ago it said that some trucks could have been affected and if this happened to tak it in. on my truck the check engine light was going on and off and it was idling so rough to the point it was almost shutting off, i took it it they replaced the value heads just a few months ago...no problems since..mine is a 2006 and a 5 cylinder too