The Honda agency received a code for “misfires” on all 6 cylinders and yet “found no cause for all cylinder misfire.” One would think that the new irridium spark plugs installed two weeks ago would solve that problem. The car has 85,000 miles, and I have religiously had it serviced by the book. After the agency charged me $100 to simply look at the problem with “no correction performed,” I decided it was time to seek help from a local Honda specialist. Supposedly the codes he found caused him to replace the EGR valve and, when that didn’t work, he installed new spark plugs. Seems like there’s more guessing going on here than actual expertise.