Q: I changed the spark plugs and now my car is puttering, revving up on its own, and making a whistling noise

如果这些症状在之前不存在spark plug replacement, it would appear as if something was disturbed, disconnected or broken during that maintenance. You want to make sure that all of the plugs were installed with the required gaskets and tightened to the correct torque, using only a torque wrench. if the plugs are loose or gaskets are missing, air will leak in and out of the combustion chambers. Also ensure that no engine sensor electrical connections or terminals were disturbed or left disconnected and that all插头组件上的线圈are intact and properly connected. If none of those checks resolves the issue, please free free to schedule a粗糙运行的引擎诊断to identify the problem.