#7 misfire number 7 cylinder is misfiring. i have replaced the coil packs and plugs. i also switch places with coil packs on cylinder that was not misfiring and still got a #7 misfire

SOURCE: engine code p0307 cylinder #7 misfire

It could be carbon deposits on valve seats keeping valves from totally closing. You can try getting you a can of motorcraft PM3 top end engine cleaner and get engine up to operating temp then remove one of the small vacuum lines from the intake and draw the contents of the can slowly into the engine.After you have drawn in the contents shut engine off and let it soak for about 45 minutes then crank it back up and let it run until it clears. Now it will smoke like a forrest fire while you are doing this so don't be alarmed,just tell the neighbors you are spraying for mosqitos.This may cure the problem. If not you may be looking at a valve job.
This can be verified with a compression test if this is what is causing it.

SOURCE: It has a number 2 cylinder misfire. I have already had the plugs, plug wires, and the back coil changed, and it still says it has a number two cylinder misfire. What can I try next?

misfire caused by leaking in the intake valve you must chek it , or may be your car is working rich that means fuel - air mixture is not on the right ratio so check your oxygen sensor

SOURCE: cylinder 5 misfire

you need to replace all 8 coil packs.

SOURCE: my 2002 mustang GT hasits a misfire on cylinder 3

Clean the mass air flow sensor.

SOURCE: KEEPS CODING 5 cylinder misfire. Replaced

Clear the computer. Either use a scanner or disconnect the NEG battery cable for 10 minutes. The old defect takes 25 to 35 startups to clear itself. Then there is the possibility that #5 is a different cylinder on that motor. The engine may be misfiring because of a bad injector on #5.