Why a 99 GMC savana stalls out and hesitates?

A 1999 GMC Savana may stall out and hesitate due to several potential issues, including fuel delivery problems, such as a clogged fuel filter or failing fuel pump. Additionally, ignition system failures, such as worn spark plugs or a malfunctioning ignition coil, can cause similar symptoms. Other possibilities include vacuum leaks, dirty air filters, or problems with the engine's sensors, such as the mass airflow sensor or throttle position sensor. Diagnosing the exact cause often requires checking these components systematically.