Dodge Neon misfire issue prevents starting unless vacuum hose is removed from valve cover on Dodge Neon

Some Dodge Neon owners report experiencing misfire issues that prevent the vehicle from starting unless a vacuum hose is removed from the valve cover. These misfires can be attributed to several factors, including bad spark plugs, which may lead to backfires and poor engine performance. Additionally, vacuum leaks can introduce unmetered air into the combustion chamber, resulting in a lean air/fuel mixture that causes misfires. Some owners also report problems with fuel injectors not delivering sufficient fuel, which can further exacerbate the misfire condition. Specific issues such as fouled spark plugs, faulty spark plug wires, or a malfunctioning coil pack have also been noted as contributing factors. To troubleshoot these problems, it is recommended that owners inspect spark plugs, wires, and vacuum hoses for damage, as well as check for unmetered air and rotate components to isolate the misfire to a specific cylinder. Prompt inspection and diagnostic testing are crucial for resolving these starting issues effectively.