Bad plugs, bad plug wires, carbon build-up in the combustion chamber, incorrect fuel ratio, to name just a few. Consider a tuneup and a fuel system cleaner product at your next fill up.
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There are several things that can cause your 2003 or Expedition to misfire. The most common cause is a plugged catalytic converter.
usually a misfire is either the spark plug or coil pack for that cyl. first I would change plug then change coil pack Take to dealer is still under waranty? Try replacing spark plugs.
Yes.
It could.
A defective aspirator valve would unlikely cause a misfire monitor failure. It would more likely cause an air system monitor failure
If you have a "check engine" light on, start with having the codes read. A misfire code can tell you which cylinder or cylinders are having problems. A misfire could be the cause of your engine vibration.
Depending on what year the vehicle, if the vehicle year is pre-cat it could cause a back fire under deacceleration. If the vehicle year is post-cat it could cause false 02 readings.
It means that more than one cylinder has a misfire history. PO301 would be cylinder number 1 misfire. PO302 would be number 3 cylinder misfire.
chk. compression,150 is normal,about 120 or less in no. 6 and it will miss at idle,but you wont feel it under a load.
Sounds like a misfire caused by electric supply to plugs.
005 gap is pretty minimal. While the engine may not run perfect and fuel economy may be affected, it is not enof of a difference to cause sputter and misfire. A .005 gap difference in what we need to know.