I have a 06 mustang GT I keep getting a cylinder 6 misfire. I replaced all 8 spark plugs and no change. Performed a relative compression test several time cold all cylinders passed at 100% compression. Back probed cyl 6 injector and coil circuits at the pcm. The test light was flashing bright and consistent while miss was occurring. Also preformed engine running compression test on cyl 6 found compression at 75 psi running and would intermittently drop 25 psi... What can I do to fix this problem?

 

Even with all the info you gave I am a little to inexperienced to be of much help. But here is a free bump to help out and welcome to MF.com!

 

thanks appreciate it