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2004 Ford Explorer V6 idles rough but runs fine when accelerating

I have 71k miles on my '04 explorer. I put gas from Costco in it and it started to idle rough shortly after out of the blue. I thought maybe there was water in the gas so I added Heet to the tank and it didn't help. I ran a few more tanks of gas through it (the best I have in my area) and it didn't change much so I added Fuel Injector cleaner to the tank. It fixed the problem until that tank of treated gas got below 1/2 full and it started back again. The car runs ok otherwise and I don't notice any real change in acceleration. My next step is to try the fuel filter or clean the throttle body. Any help would be great. I'd like to get it fixed before I go on Deployment.

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