I have an 87 glhs 53k mi. i've recently replaced the fuel pump, distributor, halls effects, plugs and wires. when i engage the starter the car starts, as soon as i release the the key the car stumbles off with the key in the on position. i noticed asd and fuel pump prime are randomly turning on and off. I checked fuel pressure, 53psi, and spark at coil and coil lights but only when cranking or when asd turns on. I cant think of what else it maybe? Everyone ever had this problem?? THanks John