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how bad was the flood? change the fuel filter? have you tried to check the plugs/wires for a misfire? it may not throw a code because its so slight. worth a shot. maybe its a bad opti. if you have the old one, or can get another, i'd put it on. its a strange issue though. start with the basics though. maybe the throttle plates are dirty with carbon. carb cleaner would help. bad/dirty fuel injectors? flush the fuel system? could have water in the tank. dry Iso-Dry, its a fuel stabilizer. we have a canister that hooks to the fuel rail for cleaning the top end and injectors. if you could get your hands on one, run straight gas or a little GM top engine cleaner through it, see how it runs like that. did you do the work? if not, bring it back. get a list going and start crossing things off.
double check your short term and long term fuel trim.
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