1999 Chevy Tahoe Crankshaft sensor code problem

A couple of months earlier, my Tahoe set a Crankshaft Position sensor code. I replaced the sensor, which did not fix the problem. The actual problem was that the wiring harness to the sensor had several burned wires that were laying against the exhaust manifold. I repaired the wires and life seemed to be back to normal. The truck had been running fine until two days ago. The truck started acting the exact same way. It is cutting out, spitting and sputtering and struggles to keep running when at idle. It set the same Crankshaft Position sensor code and also set a Camshaft Position sensor code. Since that point, I have done the following: 1. Replaced the Crankshaft sensor 2. Replaced the fuel pump in the gas tank 3. Replaced the fuel filter 4. Replaced the ignition module (I believe that's the correct name.) It's located just to the left of the throttle body. None of these have seemed to make an improvement at all. As of tonight, I am planning on rebuilding the portion of the wiring harness I repaired a few months earlier, thinking that maybe I missed a bad portion of the wire. If that doesn't help, I'm planning on having the ECM tested. Please let me know what you think as this problem has definitely got me and my local shade tree mechanic stumped. Thanks.