What you got here is a nightmare, you sure its not possesed. New O2 sensor/s are they OEM parts.

Misfires can be caused by worn or fouled spark plugs, a weak spark (weak coil, bad spark plug wire), loss of compression, vacuum leaks, anything that causes an unusually lean fuel mixture (lean misfire), an EGR valve that is stuck open, dirty fuel injectors, low fuel pressure, or even bad fuel.

A Random Misfire code usually indicates a vacuum leak or bad gas.

If a misfire in a specific cylinder should lead you to check the spark plug, fuel injector and compression

Answered by rasmataz
68 questions asked

Hello again. Ok, I also install new plugs and wires (wires are in proper order). The thing that has me wondering is the vacuum, 40-50 inches. Is there such thing as to much vacuum? I do need to check the EGR and its components. Fuel pressure is 36-43 psi depending if I have the pressure regulators vacuum hose connected. Yes, the oxygen sensors are the proper bosch components.

Response from kycsailor
2 questions asked