Chevrolet Trailblazer EXT persistent misfiring issue after replacing 4 ignition coils and 6 spark plugs on Chevrolet Trailblazer EXT

Some Chevrolet Trailblazer EXT owners report experiencing persistent misfiring issues even after replacing four ignition coils and six spark plugs. These misfires may be attributed to a faulty fuel intake system, where improper fuel injection can lead to performance problems. Additionally, some owners have found that even new spark plugs can cause misfiring if they were poorly installed or are of the incorrect type. Issues with worn or damaged ignition coils can also prevent the necessary voltage from reaching the spark plugs, contributing to the misfire. It is crucial for owners to determine if the misfire is specific to a particular cylinder, which can be assessed by swapping components like spark plugs and coils between cylinders. Furthermore, inspecting the valve cover for bent pushrods or compromised valve springs may aid in diagnosing the issue. If problems persist, additional troubleshooting steps such as checking for vacuum leaks, inspecting the fuel system for clogs, or testing cylinder compression might be required to identify the root cause of the misfiring.