Hello shaner,
the electronic fuel system can be a nightmare. my only advice ( form experience) is to check the coil inside the distributor install new ignition kit. Install a new LPG converter and/or kits. The system is very sensitive. it must have the right amount of fuel to the carburetor to run properly. Less is more. If you have repaired wiring make sure you have good conductivity in the wire. Just curious is this an LPS truck?