i read in another forum that a guy had rough idle in his 04 i believe. some one mentioned rail relief and that once you hit or blow off at or over 235000 psi the relief valve is shot. he said its a one time use or one time blow off

 

usually once they pop they tend to get weaker

 

Ya I want some more info on that also I seem to be gettin a rough idle also and mostly right when I start up

 

sometimes they blow once and they are done. Others re-seat and just get weaker each time. If the relief valve is bad enough to cause a rough idle, it usually will continue to run rough all the way thru the rpm's. Not too mention it would be hard to start.

Rough idles are usually a sign of worn injectors also.

 

I had one go on my 06 I had and it was down on power pretty bad would not build boost did the pipe plug mod on it and it was all better. I did not notice a rough idle though.