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Im not getting a CEL (check engine light) Wouldn't a lean injector or a problem with the EGR throw a CEL?

I own a 2k Lincoln LS V6 5spd. In the past few months ive noticed a very noticable ping. Its not the gas because ive tried at least 10 different types of 93 octane. I understand that pinging is usually suppose to occur during heavy load or cheapper gas. My LS pings under normal driving...