I'll give you a heads up that happened to me. At 18000 with the factory 32F's I aquired the Alex Peper OBD-2 software and was learning to use it/experimenting. I found that is was showing misfires but felt nothing or noticed.
I changed the plugs to the 32PPm's, the result was definite seat of the pants low-end and next full tank jumped 2-3mpg beter around town.
Those same plugs are still there, last month I checked and the OBD (Scan) showed minor misfires on one or two of the rear plugs, did the swap even though the plugs looked fine. No more misfires. Be glad when this type of ignition is replaced with the COP. Coil over Plug.
Wonder if the new 2.5's in Europe have been changed over to COP??? Elimates the plug wire issue, also.
Only bad thing is the RFI generated by the COP, for those who run VHF/UHF mobile radios.
Paul
