According to the Holley forums the cam and crank sensor wiring has its ground drain back to the ECU. But if you’ve extended those wires you may need to make sure that grounding path is not broken. Good info here: Crank & Cam Sensor Lead Shielding - Holley Performance Products Forums
I might have mis spoke. I’m going to go back through my diagram and instructions for the aem infinity and see if they want the drain grounded at the ecu or sensor end. Let’s see if Holley and AEM agree
