lcmon

Hello, I am new here. my son bought a O2 24 valve Cummins a number of months ago without knowing much about it history. We've been trying to figure out what's going on with this ghost revving. Without touching the gas pedal after you start it it'll start quickly jumping up to higher RPMs sometimes getting a little scary and staying there. It worried us enough to where we brought it to our local mechanic.. he had it for over a month flushed all the fluids and did some other maintenance, but ultimately couldn't figure out the main problem we brought it in for. I've had it back home for a couple weeks and I have ordered and installed a new genco alternator., installed a new Timbo APPS, I am done a fair amount of testing. It's not showing any codes with my code reader and this is also something the mechanic was frustrated by. he couldn't get any codes to show up. I figured I had it nailed with the new APPS and alternator. This is mostly because I tested for AC ripple and tested high. Then low and behold, none of my attempts have had any success, and basically just left me frustrated after wasting a lot of time and money. Today I'm gonna try rerouting the wire that some claim is affected by the electromagnetic field coming from the alternator. I'm not very confident that this will do much but I'm gonna try it anyway. I'm also gonna check my grounds and tighten them clean them whatever. I thought I'd ask on here to see if anybody had any ideas before we tow it to a mechanic a long distance from our home who specializes in these trucks, because I'm nearly to that point. Thanks.