Troubleshooting an ongoing intermittent "No Start" problem that keeps leaving me stranded on my '04 6.0. The truck left me stranded Sunday, but eventually fired and ran OK getting home. I replaced another CMP Sensor Sunday, but that did NOT fix the "no start". Today, when monitoring using AE's Live Data, "CMP/CKP sync" keeps flip flopping back and forth between 0 and 1 about every second or so. I'm assuming this is NOT normal for the signal to be flip flopping that often, and so the signal is being interrupted between the CMP, CKP and FICM. The FICM is an upgraded Swamp's Diesel 58 Volt FICM going on 7 or 8 years old now, but it always test OK on the Power Side, and does today. I know the Logic Side can also go south, so that may be the issue, but no way to confirm or test it that I'm aware of before sending it in for repair. I'm leaning towards replacing the engine harness and the CKP sensor while I'm behind the AC Compressor to swap out the electrical connector even though supposedly CKP sensors rarely fail, and it's not the original sensor (replaced years ago due to leaking/failed o-ring). Comments...?