[Tspringer]

Before doing the leak down test again, try this. Get the car up to full operating temperature. Then spray a fine mist of water into the air intake while revving the engine. Use a sprayer that puts out a fine mist - do NOT pour water into the intake. (I mention this because of a post from a guy who had read about this trick but did not understand that you were supposed to spray a mist of water - instead he poured water into the intake and busted a rod).

The mist of water turns to steam and does a great job of cleaning off carbon deposits. I have used a bore scope to look into a combustion chamber at nasty carbon gooked up piston domes then done this trick resulting in clean carbon free domes.