90 w350 360 gas efi 727. Having trouble starting but once it starts runs perfect and starts perfect until I let it sit say overnight. Checked all wiring, cleaned and used dielectric on all connections. All fusible links ok. Have replaced: cap, rotor, plugs, wires, coil, pick up, ASD, ignition switch, fuel pump. Added new grounds from body to frame. Cleaned all ground connections. To get this thing started I have to cycle the key like 50 times. First the ASD will "wake up" then a few more cycles will get the idle speed motor and fuel pump to "wake up". Then it starts and runs great until I let it sit for a few hours. PCM????? Im totally perplexed