What kind of plugs are you using? Just a little info if it is pretty much anything other than champions then they suck in our engines that may be your only problem. I tried running bosch plat's and couldn't keep my engine running on them. got some champions and had the smoothest idle.
HD Diesel Mechanic
00 Durango 5.9L SLT
I've got a few things done
Could be the wires. You should use OEM only. There are a couple of others like MSD or such. Stay away from Bosch and other replacement wires from regular auto part stores. Also it helps to know what motor you are working on. [>:]
Moto: I don't take sides, I hate everyone equally --- #1 V10 Club Member V10 Club