Awhile back I posted for help on a rough idle;I think I found the problem.After cleaning the IAC,MAF,throttle body,etc. I decided to pull a plug from each bank to read them.At 70k miles I installed Autolite DPs #42EE gapped at .054.Now at 85k miles they are reading .064 gap. Thats alot of wear for just 15k miles.So,now I am going to replace them with Autolite copper plugs,part # 765 gapped at .054.I'll post the results after the install!