Do you get another code with the misfire code? Sometimes you get a lean code with the misfire. Try this...
Check your oil. Does it smell like fuel???
What happens a lot on a bad misfire is the unburned fuel makes it's way into the crankcase and these fuel vapors are sucked back into the intake by the PCV system. That causes a rich mixture and more misfires due to the rich mixture caused by the fuel vapors. So change your oil and remove all the plugs and clean them well with brake cleaner if you don't have a spark plug cleaner.
Another reason you could still have a misfire is also related to oil.
Sometimes when you have a misfire the unburned fuel washes the rings down so you will have a temporary drop in compression in that cylinder. To fix this again change the oil and filter and clean the plugs and run it until it goes away. Don't worry if it's reason #2 the compression will return to normal.
2003 Ford Expedition
2006 F150 STX 1996 Mustang GT Too many track passes...
The plugs are fine. I'm using IT-16 DENSO IRIDIUM Plugs .
I'm not suprised that you're already having a failure...aftermarket pieces like this are always trouble and less relable than the OEM parts. Fine for a street/strip car,but not for a daily driven truck.
Unless you're running an application that needs it, aftermarket "performance" COPs are a waste of money. The factory COPs do just fine. GMS COPs (that's what those "Motoblue" COPs are) while delivering better performance on high-compression applications at high RPMs in my experience have a high failure rate. I carry a spare because of it!
You'll see the subtle difference on a dyno with GMS COPs with a blower (where you normally see a slight amount of flutter it disappears) but not really with stock.
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