Good evening Mr. Kurt K
Maybe this might help.
I have also run up against the same problem. Intermittent dropping RPM, EEC light, bucking. Sometimes a hard fail. Troubleshooting only lead me to the CAM sensor and or DIS harness. I even replace the DIS module with silver heat sink compound. Would work but within 3 months and especially when outside temperatures exceeded 115 + degrees it was a failure. So would begin troubleshooting/parts cycle.
So in Aug 2020 I removed the DIS harness. I decided to use the EVTM and ohms check the entire DIS harness staring from CAM/CRANK sensor connectors to both the GRAY and BLACK DIS connectors. Checked my spares. All bad. The surprising clue that I ignored over the years was when removing the harness it would do a strange "twist memory movement" at the wiring connectors. Slight twisting while ohms testing was the key to finding the issue. I believe over the years constant twisting/ un twisting/pulling/heat cycling causes the insulation to break and expose wiring to the elements, corrosion and or fraying. For me this was especially true at the CAM sensor connector.
Ordered/acquired all necessary connectors, wiring/ looms, 3M electrical copper shielding and TESA electrical tape. Overhauled/Repaired the DIS harness Sept 2020. At the time of this post, no intermittent EEC light codes for CAM sensor, no bucking, no tack drop. Car runs and sound better. Can't wait for the summer.