Need help: throwing misfire codes

[BLKBULLITT]

06 mustang GT

I'm throwing P0300 (multiple cylinder misfire), P0302 (cylinder 2 misfire) codes on my scanner.

First thing I did was change the plugs and put in new ones (they all came out in one piece!!)

Cleared the code, went for a hour boot (drove the car hard) no problems. Let it sit for a little bit fired up went around the block and got the misfire code again.

- I changed around the coil to see if it's maybe a bad coil and cleared the code. Figure if it is then it'll pop up in another cylinder?

What else could It be? Next step I suppose it to check my injector. Bad case of fuel?

 

[07 Boss]

I don't think it is a particular coil pack as that would tend to throw a misfire code for one particular cylinder. Since it seems like it is multiple cylinders I would check your grounds. i know all of the coils come together on each side into one common ground. I'm not sure both sides are connected but they could be.

 

[Gabe]

What plugs did you put in?
Autolite?

 

[BLKBULLITT]

What plugs did you put in?
Autolite?

1 piece champion double platinum plugs. The stock ones weren't even bad them selves still had plenty of life

 

[07 Boss]

1 piece champion double platinum plugs. The stock ones weren't even bad them selves still had plenty of life

Did you check the gaps on those plugs? I wouldn't even put champions in my lawn mower, but that's me.

 

[Gabe]

Unless boosted, you really should only be running the Motorcrafts ... all others will misfire.
When I was a writer, I can't remember how many new non-Ford plugs we replaced with Ford plugs after the customer came in saying the car's running rough, check engine light on or flashing, and they just had a tune-up done "with their mechanic"

 

[BLKBULLITT]

Unless boosted, you really should only be running the Motorcrafts ... all others will misfire.
When I was a writer, I can't remember how many new non-Ford plugs we replaced with Ford plugs after the customer came in saying the car's running rough, check engine light on or flashing, and they just had a tune-up done "with their mechanic"

I have NEVER heard of that before.... I put these in and changed the fuel filter and swapped around the coil and light went away. Gonna see over next few days if anything pops up.

 

[702GT]

I have NEVER heard of that before.... I put these in and changed the fuel filter and swapped around the coil and light went away. Gonna see over next few days if anything pops up.

By "double platinum" do you mean they are of the design that they have 2 grounding posts? (Like the Bosch +2's)?