Why does the van not accelerate and make a sputtering sound?

[MacSpencer]

When a van cannot accelerate and makes a sputtering sound, it is usually caused by an engine misfire. Below is an introduction to engine misfires: 1. Overview: An engine misfire refers to a fault in the engine that leads to insufficient power, resulting in a lack of power, where a few cylinders out of the total number of cylinders are not working. An engine misfire can shorten the oil change interval, easily cause sudden stalling, increase fuel consumption, produce black smoke, and result in a loss of power. 2. Causes: The main causes of engine misfires stem from the ignition system and the fuel injection system. If the contacts in the distributor cap of the ignition system are severely eroded, it can cause spark jumping, mostly occurring between the corresponding terminals on the cap. The idle speed fluctuates severely, power drops significantly, and the vehicle feels like it is suffering from a severe asthma attack.