Q&A

 Master

You've got to start with the basics, check the engine is mechanically sound (good even compression, no vacuum leaks, check the engine's ignition system is good (good spark plugs coils or plug wires where applicable) then the fuel system needs to be looked at (fuel injectors operating correctly) A misfire can be caused by many things but basic diagnostic tests need to be done rather than just trying to guess what the problem is. Your car has On Board Diagnostics level 2, is a Check Engine Service engine soon light on? If so the computer in your car is going to have relevant information stored in its memory which will help figure out what is going on. A scan tool is needed to retrieve this information. A professional grade scan tool allows key engine sensor data to be analyzed right off the scan tool without having to do intrusive testing at each sensor.