It would be good to know if the same cylinders keep missing. So parts can be swapped to see if they move to another cylinder. So it is safe to say there are no other codes. I hope you used quality ignition parts.
If this is truely random intermittant then I would take a look for a small crack coming from where a weight was welded on on the outer edge of the flywheel.
This motor has had problems with valve seats. Perform a compression check and leakdown test. This will also expose a potential headgasket leak.
Also check your fuel pressure is must be in spec.
This is where I would start. If you need specs or more info, just post it.
Tuesday, March 2nd, 2010 AT 7:58 AM