Hi Scotty, I have a 1997 Nissan Altima that runs pretty ragged at low speeds. It almost shuts off at stop lights. However, on the freeway, ​it drives more consistently. I have gotten a check engine light a few times that says fuel too lean P0171? I use fuel injector cleaner like Lucas and the driving improve immediately but the symptoms come back after a few days. What could this be? It doesn't sound like the fuel pump because the car starts right up.

that old, injectors probably need replacing, get a rebuild set from Bap Geon 713 227 1544