The contact owns a 2018 Acura RDX. The contact received notification of NHTSA Campaign Number: 23V858000 (Fuel System, Gasoline); however, the part to do the recall repair was unavailable. The contact stated that the manufacturer had exceeded a reasonable amount of time for the recall repair. The manufacturer was not made aware of the issue. The contact stated while driving approximately 40 MPH, the vehicle started sputtering and almost stalled. The contact stated that there was a yellow exclamation mark on the instrument cluster. The contact stated that the failure was intermittent. The contact had not taken the vehicle to a dealer or independent mechanic to be diagnosed or repaired. The failure mileage was approximately 85,000. Parts distribution disconnect.