Hey guys, this morning when I started up my car (an '05 4.8is with 19K miles) after it had been sitting for a couple of days, I had this heavy, pulsing vibration through the car and the check engine light flashed 7 - 10 times and then turned off. I quickly turned off the car and restarted it and then it was fine.

What could be causing this? Is it serious? My car is still under warranty, so should I take it to the dealership? Or should I ignore the problem? I just hate going to the dealership.... Also, I just put in a new ITG drop in air filter replacement. Could this be causing this?

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