1. Check for faulty (or adjustment of) automatic transmission gear position switch:
https://www.askmehelpdesk.com/cars-t...tml#post258005
2. Replace distributor cap, rotor, clean and wipe down spark plug cables with silicone spray, replace main relay (likely main cause). Perform K-Test on ECM. Apply dielectric grease to terminals on both ends of spark plug cables. Wipe porcelain on spark plugs with dielectric grease. Ensure 4 wires going to igniter and 2 wires going to coil are clean and tight--apply thin coat of dielectric grease, before assembly. Clean main ECM ground on thermostat housing and apply dielectric grease. If problem persists, consider applying dielectric grease to ECM connectors.