Did the Honda techs do a compression test or guessed the compression were low because 2 cylinders were not firing well? Get a second opinion on this, do the compression test again.
The erractic idling could be vacumn leakage instead low compression.
Honda engines seldom wears out the cylinders, unless you have been neglecting the oil changes.
80 % of oil consumptions are from the valve seals and the sooty exhaust is from misfiring plugs.
Why don't you replace the PCV first and see if it helps.
Thursday, June 26th, 2008 AT 2:25 PM