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Guys I am at a loss. I HOPE someone can help me, this is frustrating. Bought my first 24v Cummins, it’s an 01, 3500 dually, and 5 speed nv4500. She fires up beautifully, idles normally. Then it gots warm and it idles up, stays around 1500rpm or so. The tachometer isn’t working, I tried replacing the camshaft position sensor and it didn’t fix the tachometer, maybe communication issue? Does the CPS have anything to do with idle? OBD2 computer says idling at 1500rpm. The APPS sensor was replaced, and voltage set. Stays below 0.50 volts, around .44-.48. According to the sensors live data reading, the voltage is all over the place for the other sensors too, the apps sensor is fluctuating bad, between 0 and 5v, and same with other sensors that are sensitive to voltage. I just redid the four battery terminals, grounds were in horrible shape, but the other ends going to the block and chassis are healthy. When I put a voltage meter on the APPS, I get very small fluctuations from .44 to .48, but the live data is freaking out. Things I’ve done: 1. Calibrate APPS with Multimeter on the orange/black wire coming, while setting voltage. 2. Checked alternator, it is consistent and I couldn’t find any alternating current in the system. (Unless I need an oscilloscope to see this?) 3. Checked all connections, the ECT sensor, the ground straps, everything. 4. Replaced IAT sensor 5. Replaced CPS..