HEI in Mopar ECU casing

well, ive narrowed it down to either the Plug that goes into the mopar ignition box, OR, the pins on the box itself that the plug plugs in to.. I can get it running and wiggle the plug a bunch and make it die. When the engine dies i will have to wiggle the plug more to get it to start back up..I have another plug with the wires attached and tried it and its way worse, just barely touch it and it kills the engine. The original plug is hard to figure out which wire is killing it because i can wiggle them individual, or all together and sometimes it wont kill it and sometimes it will. No certain way to wiggle it or anything, i can just keep on messing with the plug for several minutes and sometimes it will kill it and sometimes it will, and again, way more sensitive with the other plug i tried..so, hard to say weather its the plug or the terminals on the mopar box itself..