Is it pulling any codes?Maybe a bad 02 sensor? What the mileage?
I would first try replacing the plugs. You wanna do all the easy stuff first.
Plugs are done. Im going to take it for a spin after I get finished with this.
I went with the platinum Motorcrafts.
Its still misfiring. So that leads me to believe that maybe a COP is bad.
Ill pull them off again tomorrow while the engine is running and try to figure out which one is bad.
I think it only does it when the engine is under load.
I wish it would throw a code so I know which one it is.
Pulling the COP won't do anything unless the car is misfiring at that exact moment while your under the hood. The way i've had to find bad COP's in the past is go and drive it with my foot in it untill it throws a code. Then use predator to scan and find out which cylinder. Then you can check the plug, or swap plug to another cylinder, see if the mis moves or stays.
Or find the cylinder, swap the injector to another, then swap the COP to a different cylinder, if the mis moves to that cylinder you found your problem.
Def sounds like a COP though, they go bad alot on these cars.
So go out at a low speed, put in 5th and romp it, stay in it even though you'll cring, after about 10 sec a code should pop up.
Could also be a gummy injector right ? Try dumping 1/2 a bottle of injector cleaner in on a full tank and see if it gets any better.
When im in 4th or 5th and crusing if I go WOT theres a terrible shudder. The shifter looks like its going crazy..
Hoping that its only a bad plug. Im pretty sure they're the original ones so they're due for replacing.
Just happen to me too. Shifter shakes like crazy on 5th gear , that means missfireing . I had 2 go out since I got accel coil on plugs. Thank god that I bought from brother performance cause then exchange fist one like month ago and I just send one yesterday to have it exchange . In 4 months 2 went bad so I will warn others not to get accel coil on plugs.
MSD makes a COP set for the Mustangs as well but I've heard they are no better then stock.
The main complaint on stock COPs that I've heard of is either the spring in there gets broken or the boot cracks and leaks the spark. There is a kit for like 100 bux that has a heavy duty spring and boot combo that is suppose to take care of this problem and keep the spark nice and strong all the way to the plug. I don't think its a "performance" part but it is suppose to keep the COPs working at 100%. I don't know if I could find the link for that anymore but I'll check when I get home from work.
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