Went out today and I visually inspected three harness fittings. I took hold of them and turned them over, looking for corrosion. I then tugged on the grounds to see if any were loose from the anchor bolt. I pushed on the plug that goes into the FSD. I connected the hot wire I use to manually start the fuel pump, I lit up the glow plugs for 8 seconds and hit the key. The truck started up on the first turn. It sat and idled for about 5 minutes. It missed a few times during that time. When it did, it was a single miss and a small puff of smoke. Then, the truck died abruptly and wouldn't start again. I put the remote harness back on and an external FSD (that I THINK is good) but it isn't starting. ECM?