I have been running my RX -8 at low power settings while finishing up the engine install details.  Recently it ran very rough and changing the plugs fixed the problem.  The plugs that produced the rough running engine are the RE7A L and RE9BT iridium plugs that are standard with the Renessis car.  These plugs have a thin layer of  slightly moist carbon on the porcelain.  Any suggestions for cleaning?  Can I use a standard air operated blaster like is used on A/C plugs?  I believe these plugs cost around $35!  Should I be using the different plugs for the Renessis in the A/C?

Ed - Thanks for the engine data from your last flight - I plan on running some full power static tests on my A/C later this week.

Dennis H.