StableBob;
You might look at the elec. control circuit. If I recall it had an engine revolution detection switch in circuit which recieved a signal from the distributor. Also, you may find two solinoid fuel control valves. If you have dual fuel truck you have an LPG supply switch next to the steer col. that is the control for the shut off valve. Next look at the vac. hoses to be sure they are alright.
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