Fitech issues

MIne is a single turbo 5.9 with the 1200 PA. I have the MSD knock off with phasable rotor. Pump is an inline AEM 380lph on a relay, battery in the trunk. I never touched the PWM setting. Base timing is 20*. I bought an extra cap and put a hole in it to help me phase it. Wires from the distributor are shielded but I never had an idle problem before they were shielded, just an occasional fault code.