Assuming there isn't a coolant breach, I would test the fuel pressure next. The fuel pump wave pattern would be anther thing I would want to know is good.
The po420 concerns me a little more, but I think I would still focus on the misfire.
Pull a couple plugs and see if they are fuel soaked. Smell the oil, does it appear thin and smell like fuel?
I assume silicone dielectric grease was sprayed at both end of the wires. I would also assume the plugs are the correct ones. The bosch splitfire for example have been trouble from my experience.
One plug I would pull it the 3rd one and swap it with another cylinder.
Sunday, March 9th, 2008 AT 6:52 PM