I read about the Onboard Emmissions control system sometimes actually causing such wierdness. Apparently, it is so freaking sinsative about getting you the best mileage and protecting the air we breath that it is easily upset. Try rreading the manual about your OB(?) Forgot the third letter. Or, sign up to Alldata. It isn;t free but if you can't find free help, it is worth it. Mike
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Debbie, Canister is right above rear axle, hard starting after fill up is usually a bad EVAP purge valve solenoid
Check the attached links, last link shows location of purge valve.
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PO455 is a large evaporative fuel leak. A bad fuel cap is ONE of the things that COULD be the problem. Fuel system cleaning only lightened your wallet. Reading your post is confusing. Did all this start AFTER the Valvoline Wallet Flushing? If so , they left something loose or disconnected. I would find a qualified repair shop to fix the problem, and if it has anything to do with what Valvoline did, make them pay the bill.