aerodeck 1800 vti x reg help please

problem started with recent dodgy fuel fiasco. car would not accelerate,car towed to garage,lamda sensor changed car ok for 1 day
then same symptoms. back to garage .car runs ok with lamda sensor disconnected, fuel consumption high, advised to run a couple of full tanks through to flush system. back to garage ,new sensor.same symptoms, injectors cleaned ,no change. garage say ecu diagnostic showing no problems,but are now suggesting new ecu. has anyone got any suggestions before going down this route ,please
Honda Civic
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