Hey thanks for the VERY helpful tips guys...

So I've been thinking - I'm putting my 350SD in the shop this week for the GreaseCar installation (sorry, I wish I could do everything myself, but I'm a professional saxophone player - you can hear my music on my website at www.RustyBlevins.com - so I cannot risk wrecking my hands/fingers, so the installs and repairs, etc. have to be done by a pro!) and I'm thinking of asking my repair tech to replace the original fuel lines all the way through the car from the tank forward. Is that overkill? I'm convinced that my rough idle problem is somewhere in the fuel delivery because the car starts and runs BEAUTIFULLY in the morning and it only acts up intermittently with the rough idle. I'm also thinking of asking him to run a Diesel Purge, too - sounds like that is a great thing for a diesel with lots of miles on it.

Thanks again for all the helpful info - and please keep it coming! I love to read about your experiences!