Car stalls, hesitates, misfires - 1998 Oldsmobile Delta 88
There are several potential problem areas (besides fuel supply which you seem to have addressed), which could cause lean running and the symptoms you describe. A dirty throttle body (https://www.yourmechanic.com/services/clean-throttle-body), failing mass air flow sensor (https://www.yourmechanic.com/services/mass-airflow-sensor-replacement), vacuum leak (https://www.yourmechanic.com/article/is-it-safe-to-drive-with-a-vacuum-leak), or...