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CEL codes P0300, P0301, P0306 - dealer says don't worry...

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A couple of weeks ago I was tracking my 2003 996 at a DE at MSR outside of Ft. Worth. It was a very hot day (104-106) and during one of the afternoon sessions as I was driving through a high speed corner, my check engine light came on (solid). I drove back to the paddock and one of the other drivers had an ODB reader and it reported three codes:

P0300, P0301, P0306

I looked them up on the net and found that they were random misfires, cylinders 1 and 6. We reset the codes, but I wasn't going to risk taking the car back to the track. I drove it to a local dealership the next morning (the CEL light never came back on). The service manager told me that if the light wasn't blinking and didn't come back on after being reset, then the problem was probably just a random event, possibly related to the high heat and track conditions (maybe a bit of vapor lock) and not to worry about it unless the CEL light came on again.

Since then, I've driven the car another 200 miles with no CEL. Any ideas what could have caused this? I do have an EVO cold air intake system and I noticed the air filter is looking pretty dirty - could a dirty air filter cause this?

Any thoughts would be appreciated - not sure if I have a problem or not...? I have another track event coming up in September and want to make sure everything is in good shape before I go.

Thanks in advance!


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