It seems to me that the OBDII should be able to tell you which cylinder isn't firing as well as the others.
My brother, who is VERY good at Ford computers, couldn't find it with all his testing equipment. It only broke down under load and all the coils tested fine without the engine running. He finally took a coil pack off a new engine and we started swapping it out and running the engine until the problem went away. It took about 4 hours by the time we replaced the test coil where we borrowed it from and got a new one for my truck installed.
'99 Black Lightning #1212 5/12/99
Last edited by DHFerguson; 11-12-2004 at 08:41 AM.