Once and a while my 94 gt will not start. It turns over but will not start. It may start a dozen times or go two weeks with no problem, then it doesn't start. Sometimes after a few times it fires sometimes it takes quite a bit longer. It doesn't stay broke long enough to troubleshoot. When it doesn't start it doesn't have fire. I have replaced the ignition module but it has done it again. Any ideas where to look next.