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Yeah, Techron is good stuff. I've used that and LiquiMoly. I also hear good things about BG.
Starting here is a no-brainer. I've never actually solved an issue with fuel system cleaner, but that's probably because I use it regularly. At least a few times per year. Less than $10 to try, and you're doing good things for the car even if it doesn't solve the issue. In your case, run the strongest dilution recommended on the bottle. It will tell you the minimum number of gallons to mix it with, and the maximum. I have a can of the LiquiMoly Pro-Line gasoline system cleaner on hand, and it says the 500ml quantity is sufficient for 7 to 18 gallons. So I'd use it with a third of a tank or so, in your case. Maybe repeat it, or run two or three cans through a full tank.
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