Your English is a lot better than my Spanish. The problem could be bad gas. Are you losing power? Try octane booster. Some gas treatments only clean the system. This is far fetched, since I had both my catylitic converters replaced, the car has made a ticking sound. (maybe I should ask if anyone else has had that) I've never worried about it because the car runs better than it did before. I also know not all cats sound the same. I don't think it's your valve timing.
Things I was taught about Mexico: the gas is bad, the water is worse.

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2000 Camaro Z28 Monterey Maroon Metallic, A4 ,leather, 323 posi, Monsoon w/CD, T-tops, K&N

 

ZZed:
Thanks for tell me that my conutry is the responsable of my problem!!JAJAA.

Do you have any Messenger or ICQ Number? because i really nead to interact with some body about some of Our Camaros stuff.