Hello. I just changed the head gaskets on the '99 3.8L engine in my '95 Mustang. Now it will crank but not start. I drove the car to its present location last week before I tore the engine down. The details: 1. There is no spark between the ignition coil and the coil end of the spark plug that I tested. 2. My test light shows no power to the positive terminal on the large ignition coil connector. (There IS power to the primary (small) connector.) 3. When I tested the negative terminals on the ignition coil connector while cranking the engine, the test light flashed repeatedly on each one, indicating a pulse signal from the PCM. The light flashed very weakly each time. 4. I also tested the crankshaft position sensor connector. NO POWER to that connector, either. 5. I also tested the camshaft position sensor. It has power. 6. There IS power to the fuse that I *think* governs the ignition coils--slot 18, 20A fuse, in the instrument panel fuse box. Any ideas? Thanks for reading.