Techron dosage...

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Have you tried using premium fuel. If so does the ping lessen?
And if you have added techron before with no results perhaps there isn't any carbon to clean and it may just be a fuel issue.
 
Hadn't realized the OP had tried Techron already.

Try the Walmart $20 service. If that doesn't do anything then its likely you don't have a problem with carbon in the combustion chamber.

Multiple tanks with Techron and Gumout improved my car significantly but I needed the Walmart service to get to something that they hasn't taken care of. It removed a scraping sound that was heard during acceleration and the engine now accelerates more freely.
 
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